diff --git a/Makefile b/Makefile
index 0e386da7..ad27c6c7 100644
--- a/Makefile
+++ b/Makefile
@@ -36,9 +36,9 @@ d3.custom.js: \
 	src/end.js
 
 d3.core.js: \
+	src/compat/date.js \
+	src/compat/style.js \
 	src/core/core.js \
-	src/core/date.js \
-	src/core/object.js \
 	src/core/array.js \
 	src/core/this.js \
 	src/core/functor.js \
@@ -185,6 +185,7 @@ d3.geo.js: \
 	src/geo/mercator.js \
 	src/geo/path.js \
 	src/geo/bounds.js \
+	src/geo/greatCircle.js \
 	src/end.js
 
 d3.csv.js: \
diff --git a/d3.geo.js b/d3.geo.js
index 0dc051e1..4c4f4ac7 100644
--- a/d3.geo.js
+++ b/d3.geo.js
@@ -17,7 +17,7 @@ d3.geo.azimuthal = function() {
         sx1 = Math.sin(x1),
         cy1 = Math.cos(y1),
         sy1 = Math.sin(y1),
-        k = mode == "stereographic" ? 1 / (1 + sy0 * sy1 + cy0 * cy1 * cx1) : 1,
+        k = mode === "stereographic" ? 1 / (1 + sy0 * sy1 + cy0 * cy1 * cx1) : 1,
         x = k * cy1 * sx1,
         y = k * (sy0 * cy1 * cx1 - cy0 * sy1);
     return [
@@ -26,9 +26,22 @@ d3.geo.azimuthal = function() {
     ];
   }
 
+  azimuthal.invert = function(coordinates) {
+    var x = (coordinates[0] - translate[0]) / scale,
+        y = (coordinates[1] - translate[1]) / scale,
+        p = Math.sqrt(x * x + y * y),
+        c = mode === "stereographic" ? 2 * Math.atan(p) : Math.asin(p),
+        sc = Math.sin(c),
+        cc = Math.cos(c);
+    return [
+      (x0 + Math.atan2(x * sc, p * cy0 * cc + y * sy0 * sc)) / d3_radians,
+      Math.asin(cc * sy0 - (y * sc * cy0) / p) / d3_radians
+    ];
+  };
+
   azimuthal.mode = function(x) {
     if (!arguments.length) return mode;
-    mode = x;
+    mode = x + "";
     return azimuthal;
   };
 
@@ -79,6 +92,18 @@ d3.geo.albers = function() {
     ];
   }
 
+  albers.invert = function(coordinates) {
+    var x = (coordinates[0] - translate[0]) / scale,
+        y = (coordinates[1] - translate[1]) / scale,
+        p0y = p0 + y,
+        t = Math.atan2(x, p0y),
+        p = Math.sqrt(x * x + p0y * p0y);
+    return [
+      (lng0 + t / n) / d3_radians,
+      Math.asin((C - p * p * n * n) / (2 * n)) / d3_radians
+    ];
+  };
+
   function reload() {
     var phi1 = d3_radians * parallels[0],
         phi2 = d3_radians * parallels[1],
@@ -177,14 +202,23 @@ d3.geo.mercator = function() {
       translate = [480, 250];
 
   function mercator(coordinates) {
-    var x = (coordinates[0]) / 360,
-        y = (-180 / Math.PI * Math.log(Math.tan(Math.PI / 4 + coordinates[1] * Math.PI / 360))) / 360;
+    var x = coordinates[0] / 360,
+        y = -(Math.log(Math.tan(Math.PI / 4 + coordinates[1] * d3_radians / 2)) / d3_radians) / 360;
     return [
       scale * x + translate[0],
       scale * Math.max(-.5, Math.min(.5, y)) + translate[1]
     ];
   }
 
+  mercator.invert = function(coordinates) {
+    var x = (coordinates[0] - translate[0]) / scale,
+        y = (coordinates[1] - translate[1]) / scale;
+    return [
+      360 * x,
+      2 * Math.atan(Math.exp(-360 * y * d3_radians)) / d3_radians - 90
+    ];
+  };
+
   mercator.scale = function(x) {
     if (!arguments.length) return scale;
     scale = +x;
@@ -564,4 +598,95 @@ function d3_geo_boundsPolygon(o, f) {
     f.apply(null, a[i]);
   }
 }
+// From http://williams.best.vwh.net/avform.htm#Intermediate
+d3.geo.greatCircle = function() {
+  var source = d3_geo_greatCircleSource,
+      target = d3_geo_greatCircleTarget,
+      n = 100,
+      radius = 6371; // Mean radius of Earth, in km.
+  // TODO: breakAtDateLine?
+
+  function greatCircle(d, i) {
+    var from = source.call(this, d, i),
+        to = target.call(this, d, i),
+        x0 = from[0] * d3_radians,
+        y0 = from[1] * d3_radians,
+        x1 = to[0] * d3_radians,
+        y1 = to[1] * d3_radians,
+        cx0 = Math.cos(x0), sx0 = Math.sin(x0),
+        cy0 = Math.cos(y0), sy0 = Math.sin(y0),
+        cx1 = Math.cos(x1), sx1 = Math.sin(x1),
+        cy1 = Math.cos(y1), sy1 = Math.sin(y1),
+        d = Math.acos(sy0 * sy1 + cy0 * cy1 * Math.cos(x1 - x0)),
+        sd = Math.sin(d),
+        f = d / (n - 1),
+        e = -f,
+        path = [],
+        i = -1;
+
+    while (++i < n) {
+      e += f;
+      var A = Math.sin(d - e) / sd,
+          B = Math.sin(e) / sd,
+          x = A * cy0 * cx0 + B * cy1 * cx1,
+          y = A * cy0 * sx0 + B * cy1 * sx1,
+          z = A * sy0       + B * sy1;
+      path[i] = [
+        Math.atan2(y, x) / d3_radians,
+        Math.atan2(z, Math.sqrt(x * x + y * y)) / d3_radians
+      ];
+    }
+
+    return path;
+  }
+
+  greatCircle.source = function(x) {
+    if (!arguments.length) return source;
+    source = x;
+    return greatCircle;
+  };
+
+  greatCircle.target = function(x) {
+    if (!arguments.length) return target;
+    target = x;
+    return greatCircle;
+  };
+
+  greatCircle.n = function(x) {
+    if (!arguments.length) return n;
+    n = +x;
+    return greatCircle;
+  };
+
+  greatCircle.radius = function(x) {
+    if (!arguments.length) return radius;
+    radius = +x;
+    return greatCircle;
+  };
+
+  // Haversine formula for great-circle distance.
+  greatCircle.distance = function(d, i) {
+    var from = source.call(this, d, i),
+        to = target.call(this, d, i),
+        x0 = from[0] * d3_radians,
+        y0 = from[1] * d3_radians,
+        x1 = to[0] * d3_radians,
+        y1 = to[1] * d3_radians,
+        sy = Math.sin((y1 - y0) / 2),
+        sx = Math.sin((x1 - x0) / 2),
+        a = sy * sy + Math.cos(y0) * Math.cos(y1) * sx * sx;
+
+    return radius * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+  };
+
+  return greatCircle;
+};
+
+function d3_geo_greatCircleSource(d) {
+  return d.source;
+}
+
+function d3_geo_greatCircleTarget(d) {
+  return d.target;
+}
 })();
diff --git a/d3.geo.min.js b/d3.geo.min.js
index 3f380b54..8b8aa9be 100644
--- a/d3.geo.min.js
+++ b/d3.geo.min.js
@@ -1 +1 @@
-(function(){function m(a,b){for(var c=a.coordinates[0],d=0,e=c.length;d<e;d++)b.apply(null,c[d])}function l(a,b){b.apply(null,a.coordinates)}function k(a,b){for(var c=a.coordinates,d=0,e=c.length;d<e;d++)for(var f=c[d][0],g=0,h=f.length;g<h;g++)b.apply(null,f[g])}function j(a,b){for(var c=a.coordinates,d=0,e=c.length;d<e;d++)for(var f=c[d],g=0,h=f.length;g<h;g++)b.apply(null,f[g])}function i(a,b){for(var c=a.coordinates,d=0,e=c.length;d<e;d++)b.apply(null,c[d])}function h(a,b){for(var c=a.features,d=0,f=c.length;d<f;d++)e(c[d].geometry,b)}function g(a,b){e(a.geometry,b)}function e(a,b){a.type in f&&f[a.type](a,b)}function d(a,b){return b&&b.type in a?a[b.type](b):""}function c(){return 0}function b(a){return"m0,"+a+"a"+a+","+a+" 0 1,1 0,"+ -2*a+"a"+a+","+a+" 0 1,1 0,"+2*a+"z"}d3.geo={},d3.geo.azimuthal=function(){function j(c){var g=c[0]*a-f,j=c[1]*a,k=Math.cos(g),l=Math.sin(g),m=Math.cos(j),n=Math.sin(j),o=b=="stereographic"?1/(1+i*n+h*m*k):1,p=o*m*l,q=o*(i*m*k-h*n);return[d*p+e[0],d*q+e[1]]}var b="orthographic",c,d=200,e=[480,250],f,g,h,i;j.mode=function(a){if(!arguments.length)return b;b=a;return j},j.origin=function(b){if(!arguments.length)return c;c=b,f=c[0]*a,g=c[1]*a,h=Math.cos(g),i=Math.sin(g);return j},j.scale=function(a){if(!arguments.length)return d;d=+a;return j},j.translate=function(a){if(!arguments.length)return e;e=[+a[0],+a[1]];return j};return j.origin([0,0])},d3.geo.albers=function(){function k(){var d=a*c[0],e=a*c[1],k=a*b[1],l=Math.sin(d),m=Math.cos(d);f=a*b[0],g=.5*(l+Math.sin(e)),h=m*m+2*g*l,i=Math.sqrt(h-2*g*Math.sin(k))/g;return j}function j(b){var c=g*(a*b[0]-f),j=Math.sqrt(h-2*g*Math.sin(a*b[1]))/g;return[d*j*Math.sin(c)+e[0],d*(j*Math.cos(c)-i)+e[1]]}var b=[-98,38],c=[29.5,45.5],d=1e3,e=[480,250],f,g,h,i;j.origin=function(a){if(!arguments.length)return b;b=[+a[0],+a[1]];return k()},j.parallels=function(a){if(!arguments.length)return c;c=[+a[0],+a[1]];return k()},j.scale=function(a){if(!arguments.length)return d;d=+a;return j},j.translate=function(a){if(!arguments.length)return e;e=[+a[0],+a[1]];return j};return k()},d3.geo.albersUsa=function(){function e(e){var f=e[0],g=e[1];return(g>50?b:f<-140?c:g<21?d:a)(e)}var a=d3.geo.albers(),b=d3.geo.albers().origin([-160,60]).parallels([55,65]),c=d3.geo.albers().origin([-160,20]).parallels([8,18]),d=d3.geo.albers().origin([-60,10]).parallels([8,18]);e.scale=function(f){if(!arguments.length)return a.scale();a.scale(f),b.scale(f*.6),c.scale(f),d.scale(f*1.5);return e.translate(a.translate())},e.translate=function(f){if(!arguments.length)return a.translate();var g=a.scale()/1e3,h=f[0],i=f[1];a.translate(f),b.translate([h-400*g,i+170*g]),c.translate([h-190*g,i+200*g]),d.translate([h+580*g,i+430*g]);return e};return e.scale(a.scale())};var a=Math.PI/180;d3.geo.mercator=function(){function c(c){var d=c[0]/360,e=-180/Math.PI*Math.log(Math.tan(Math.PI/4+c[1]*Math.PI/360))/360;return[a*d+b[0],a*Math.max(-0.5,Math.min(.5,e))+b[1]]}var a=500,b=[480,250];c.scale=function(b){if(!arguments.length)return a;a=+b;return c},c.translate=function(a){if(!arguments.length)return b;b=[+a[0],+a[1]];return c};return c},d3.geo.path=function(){function n(a){return Math.abs(d3.geom.polygon(a.map(f)).area())}function l(a){var b=d3.geom.polygon(a[0].map(f)),c=b.centroid(1),d=c[0],e=c[1],g=Math.abs(b.area()),h=0,i=a.length;while(++h<i)b=d3.geom.polygon(a[h].map(f)),c=b.centroid(1),d-=c[0],e-=c[1],g-=Math.abs(b.area());return[d,e,6*g]}function k(a){var b=n(a[0]),c=0,d=a.length;while(++c<d)b-=n(a[c]);return b}function h(a){return f(a).join(",")}function g(c,f){typeof a=="function"&&(e=b(a.apply(this,arguments)));return d(i,c)}var a=4.5,e=b(a),f=d3.geo.albersUsa(),i={FeatureCollection:function(a){var b=[],c=a.features,e=-1,f=c.length;while(++e<f)b.push(d(i,c[e].geometry));return b.join("")},Feature:function(a){return d(i,a.geometry)},Point:function(a){return"M"+h(a.coordinates)+e},MultiPoint:function(a){var b=[],c=a.coordinates,d=-1,f=c.length;while(++d<f)b.push("M",h(c[d]),e);return b.join("")},LineString:function(a){var b=["M"],c=a.coordinates,d=-1,e=c.length;while(++d<e)b.push(h(c[d]),"L");b.pop();return b.join("")},MultiLineString:function(a){var b=[],c=a.coordinates,d=-1,e=c.length,f,g,i;while(++d<e){f=c[d],g=-1,i=f.length,b.push("M");while(++g<i)b.push(h(f[g]),"L");b.pop()}return b.join("")},Polygon:function(a){var b=[],c=a.coordinates,d=-1,e=c.length,f,g,i;while(++d<e){f=c[d],g=-1,i=f.length,b.push("M");while(++g<i)b.push(h(f[g]),"L");b[b.length-1]="Z"}return b.join("")},MultiPolygon:function(a){var b=[],c=a.coordinates,d=-1,e=c.length,f,g,i,j,k,l;while(++d<e){f=c[d],g=-1,i=f.length;while(++g<i){j=f[g],k=-1,l=j.length-1,b.push("M");while(++k<l)b.push(h(j[k]),"L");b[b.length-1]="Z"}}return b.join("")},GeometryCollection:function(a){var b=[],c=a.geometries,e=-1,f=c.length;while(++e<f)b.push(d(i,c[e]));return b.join("")}},j={FeatureCollection:function(a){var b=0,c=a.features,e=-1,f=c.length;while(++e<f)b+=d(j,c[e]);return b},Feature:function(a){return d(j,a.geometry)},Point:c,MultiPoint:c,LineString:c,MultiLineString:c,Polygon:function(a){return k(a.coordinates)},MultiPolygon:function(a){var b=0,c=a.coordinates,d=-1,e=c.length;while(++d<e)b+=k(c[d]);return b},GeometryCollection:function(a){var b=0,c=a.geometries,e=-1,f=c.length;while(++e<f)b+=d(j,c[e]);return b}},m={Feature:function(a){return d(m,a.geometry)},Polygon:function(a){var b=l(a.coordinates);return[b[0]/b[2],b[1]/b[2]]},MultiPolygon:function(a){var b=0,c=a.coordinates,d,e=0,f=0,g=0,h=-1,i=c.length;while(++h<i)d=l(c[h]),e+=d[0],f+=d[1],g+=d[2];return[e/g,f/g]}};g.projection=function(a){f=a;return g},g.area=function(a){return d(j,a)},g.centroid=function(a){return d(m,a)},g.pointRadius=function(c){typeof c=="function"?a=c:(a=+c,e=b(a));return g};return g},d3.geo.bounds=function(a){var b=Infinity,c=Infinity,d=-Infinity,f=-Infinity;e(a,function(a,e){a<b&&(b=a),a>d&&(d=a),e<c&&(c=e),e>f&&(f=e)});return[[b,c],[d,f]]};var f={Feature:g,FeatureCollection:h,LineString:i,MultiLineString:j,MultiPoint:i,MultiPolygon:k,Point:l,Polygon:m}})()
\ No newline at end of file
+(function(){function o(a){return a.target}function n(a){return a.source}function m(a,b){for(var c=a.coordinates[0],d=0,e=c.length;d<e;d++)b.apply(null,c[d])}function l(a,b){b.apply(null,a.coordinates)}function k(a,b){for(var c=a.coordinates,d=0,e=c.length;d<e;d++)for(var f=c[d][0],g=0,h=f.length;g<h;g++)b.apply(null,f[g])}function j(a,b){for(var c=a.coordinates,d=0,e=c.length;d<e;d++)for(var f=c[d],g=0,h=f.length;g<h;g++)b.apply(null,f[g])}function i(a,b){for(var c=a.coordinates,d=0,e=c.length;d<e;d++)b.apply(null,c[d])}function h(a,b){for(var c=a.features,d=0,f=c.length;d<f;d++)e(c[d].geometry,b)}function g(a,b){e(a.geometry,b)}function e(a,b){a.type in f&&f[a.type](a,b)}function d(a,b){return b&&b.type in a?a[b.type](b):""}function c(){return 0}function b(a){return"m0,"+a+"a"+a+","+a+" 0 1,1 0,"+ -2*a+"a"+a+","+a+" 0 1,1 0,"+2*a+"z"}d3.geo={},d3.geo.azimuthal=function(){function j(c){var g=c[0]*a-f,j=c[1]*a,k=Math.cos(g),l=Math.sin(g),m=Math.cos(j),n=Math.sin(j),o=b==="stereographic"?1/(1+i*n+h*m*k):1,p=o*m*l,q=o*(i*m*k-h*n);return[d*p+e[0],d*q+e[1]]}var b="orthographic",c,d=200,e=[480,250],f,g,h,i;j.invert=function(c){var g=(c[0]-e[0])/d,j=(c[1]-e[1])/d,k=Math.sqrt(g*g+j*j),l=b==="stereographic"?2*Math.atan(k):Math.asin(k),m=Math.sin(l),n=Math.cos(l);return[(f+Math.atan2(g*m,k*h*n+j*i*m))/a,Math.asin(n*i-j*m*h/k)/a]},j.mode=function(a){if(!arguments.length)return b;b=a+"";return j},j.origin=function(b){if(!arguments.length)return c;c=b,f=c[0]*a,g=c[1]*a,h=Math.cos(g),i=Math.sin(g);return j},j.scale=function(a){if(!arguments.length)return d;d=+a;return j},j.translate=function(a){if(!arguments.length)return e;e=[+a[0],+a[1]];return j};return j.origin([0,0])},d3.geo.albers=function(){function k(){var d=a*c[0],e=a*c[1],k=a*b[1],l=Math.sin(d),m=Math.cos(d);f=a*b[0],g=.5*(l+Math.sin(e)),h=m*m+2*g*l,i=Math.sqrt(h-2*g*Math.sin(k))/g;return j}function j(b){var c=g*(a*b[0]-f),j=Math.sqrt(h-2*g*Math.sin(a*b[1]))/g;return[d*j*Math.sin(c)+e[0],d*(j*Math.cos(c)-i)+e[1]]}var b=[-98,38],c=[29.5,45.5],d=1e3,e=[480,250],f,g,h,i;j.invert=function(b){var c=(b[0]-e[0])/d,j=(b[1]-e[1])/d,k=i+j,l=Math.atan2(c,k),m=Math.sqrt(c*c+k*k);return[(f+l/g)/a,Math.asin((h-m*m*g*g)/(2*g))/a]},j.origin=function(a){if(!arguments.length)return b;b=[+a[0],+a[1]];return k()},j.parallels=function(a){if(!arguments.length)return c;c=[+a[0],+a[1]];return k()},j.scale=function(a){if(!arguments.length)return d;d=+a;return j},j.translate=function(a){if(!arguments.length)return e;e=[+a[0],+a[1]];return j};return k()},d3.geo.albersUsa=function(){function e(e){var f=e[0],g=e[1];return(g>50?b:f<-140?c:g<21?d:a)(e)}var a=d3.geo.albers(),b=d3.geo.albers().origin([-160,60]).parallels([55,65]),c=d3.geo.albers().origin([-160,20]).parallels([8,18]),d=d3.geo.albers().origin([-60,10]).parallels([8,18]);e.scale=function(f){if(!arguments.length)return a.scale();a.scale(f),b.scale(f*.6),c.scale(f),d.scale(f*1.5);return e.translate(a.translate())},e.translate=function(f){if(!arguments.length)return a.translate();var g=a.scale()/1e3,h=f[0],i=f[1];a.translate(f),b.translate([h-400*g,i+170*g]),c.translate([h-190*g,i+200*g]),d.translate([h+580*g,i+430*g]);return e};return e.scale(a.scale())};var a=Math.PI/180;d3.geo.mercator=function(){function d(d){var e=d[0]/360,f=-(Math.log(Math.tan(Math.PI/4+d[1]*a/2))/a)/360;return[b*e+c[0],b*Math.max(-0.5,Math.min(.5,f))+c[1]]}var b=500,c=[480,250];d.invert=function(d){var e=(d[0]-c[0])/b,f=(d[1]-c[1])/b;return[360*e,2*Math.atan(Math.exp(-360*f*a))/a-90]},d.scale=function(a){if(!arguments.length)return b;b=+a;return d},d.translate=function(a){if(!arguments.length)return c;c=[+a[0],+a[1]];return d};return d},d3.geo.path=function(){function n(a){return Math.abs(d3.geom.polygon(a.map(f)).area())}function l(a){var b=d3.geom.polygon(a[0].map(f)),c=b.centroid(1),d=c[0],e=c[1],g=Math.abs(b.area()),h=0,i=a.length;while(++h<i)b=d3.geom.polygon(a[h].map(f)),c=b.centroid(1),d-=c[0],e-=c[1],g-=Math.abs(b.area());return[d,e,6*g]}function k(a){var b=n(a[0]),c=0,d=a.length;while(++c<d)b-=n(a[c]);return b}function h(a){return f(a).join(",")}function g(c,f){typeof a=="function"&&(e=b(a.apply(this,arguments)));return d(i,c)}var a=4.5,e=b(a),f=d3.geo.albersUsa(),i={FeatureCollection:function(a){var b=[],c=a.features,e=-1,f=c.length;while(++e<f)b.push(d(i,c[e].geometry));return b.join("")},Feature:function(a){return d(i,a.geometry)},Point:function(a){return"M"+h(a.coordinates)+e},MultiPoint:function(a){var b=[],c=a.coordinates,d=-1,f=c.length;while(++d<f)b.push("M",h(c[d]),e);return b.join("")},LineString:function(a){var b=["M"],c=a.coordinates,d=-1,e=c.length;while(++d<e)b.push(h(c[d]),"L");b.pop();return b.join("")},MultiLineString:function(a){var b=[],c=a.coordinates,d=-1,e=c.length,f,g,i;while(++d<e){f=c[d],g=-1,i=f.length,b.push("M");while(++g<i)b.push(h(f[g]),"L");b.pop()}return b.join("")},Polygon:function(a){var b=[],c=a.coordinates,d=-1,e=c.length,f,g,i;while(++d<e){f=c[d],g=-1,i=f.length,b.push("M");while(++g<i)b.push(h(f[g]),"L");b[b.length-1]="Z"}return b.join("")},MultiPolygon:function(a){var b=[],c=a.coordinates,d=-1,e=c.length,f,g,i,j,k,l;while(++d<e){f=c[d],g=-1,i=f.length;while(++g<i){j=f[g],k=-1,l=j.length-1,b.push("M");while(++k<l)b.push(h(j[k]),"L");b[b.length-1]="Z"}}return b.join("")},GeometryCollection:function(a){var b=[],c=a.geometries,e=-1,f=c.length;while(++e<f)b.push(d(i,c[e]));return b.join("")}},j={FeatureCollection:function(a){var b=0,c=a.features,e=-1,f=c.length;while(++e<f)b+=d(j,c[e]);return b},Feature:function(a){return d(j,a.geometry)},Point:c,MultiPoint:c,LineString:c,MultiLineString:c,Polygon:function(a){return k(a.coordinates)},MultiPolygon:function(a){var b=0,c=a.coordinates,d=-1,e=c.length;while(++d<e)b+=k(c[d]);return b},GeometryCollection:function(a){var b=0,c=a.geometries,e=-1,f=c.length;while(++e<f)b+=d(j,c[e]);return b}},m={Feature:function(a){return d(m,a.geometry)},Polygon:function(a){var b=l(a.coordinates);return[b[0]/b[2],b[1]/b[2]]},MultiPolygon:function(a){var b=0,c=a.coordinates,d,e=0,f=0,g=0,h=-1,i=c.length;while(++h<i)d=l(c[h]),e+=d[0],f+=d[1],g+=d[2];return[e/g,f/g]}};g.projection=function(a){f=a;return g},g.area=function(a){return d(j,a)},g.centroid=function(a){return d(m,a)},g.pointRadius=function(c){typeof c=="function"?a=c:(a=+c,e=b(a));return g};return g},d3.geo.bounds=function(a){var b=Infinity,c=Infinity,d=-Infinity,f=-Infinity;e(a,function(a,e){a<b&&(b=a),a>d&&(d=a),e<c&&(c=e),e>f&&(f=e)});return[[b,c],[d,f]]};var f={Feature:g,FeatureCollection:h,LineString:i,MultiLineString:j,MultiPoint:i,MultiPolygon:k,Point:l,Polygon:m};d3.geo.greatCircle=function(){function f(e,f){var g=b.call(this,e,f),h=c.call(this,e,f),i=g[0]*a,j=g[1]*a,k=h[0]*a,l=h[1]*a,m=Math.cos(i),n=Math.sin(i),o=Math.cos(j),p=Math.sin(j),q=Math.cos(k),r=Math.sin(k),s=Math.cos(l),t=Math.sin(l),e=Math.acos(p*t+o*s*Math.cos(k-i)),u=Math.sin(e),v=e/(d-1),w=-v,x=[],f=-1;while(++f<d){w+=v;var y=Math.sin(e-w)/u,z=Math.sin(w)/u,A=y*o*m+z*s*q,B=y*o*n+z*s*r,C=y*p+z*t;x[f]=[Math.atan2(B,A)/a,Math.atan2(C,Math.sqrt(A*A+B*B))/a]}return x}var b=n,c=o,d=100,e=6371;f.source=function(a){if(!arguments.length)return b;b=a;return f},f.target=function(a){if(!arguments.length)return c;c=a;return f},f.n=function(a){if(!arguments.length)return d;d=+a;return f},f.radius=function(a){if(!arguments.length)return e;e=+a;return f},f.distance=function(d,f){var g=b.call(this,d,f),h=c.call(this,d,f),i=g[0]*a,j=g[1]*a,k=h[0]*a,l=h[1]*a,m=Math.sin((l-j)/2),n=Math.sin((k-i)/2),o=m*m+Math.cos(j)*Math.cos(l)*n*n;return e*2*Math.atan2(Math.sqrt(o),Math.sqrt(1-o))};return f}})()
\ No newline at end of file
diff --git a/d3.js b/d3.js
index ccbcd8f9..3fe713cd 100644
--- a/d3.js
+++ b/d3.js
@@ -1,12 +1,16 @@
-(function(){d3 = {version: "2.0.4"}; // semver
-if (!Date.now) Date.now = function() {
+(function(){if (!Date.now) Date.now = function() {
   return +new Date;
 };
-if (!Object.create) Object.create = function(o) {
-  /** @constructor */ function f() {}
-  f.prototype = o;
-  return new f;
-};
+try {
+  document.createElement("div").style.setProperty("opacity", 0, "");
+} catch (error) {
+  var d3_style_prototype = CSSStyleDeclaration.prototype,
+      d3_style_setProperty = d3_style_prototype.setProperty;
+  d3_style_prototype.setProperty = function(name, value, priority) {
+    d3_style_setProperty.call(this, name, value + "", priority);
+  };
+}
+d3 = {version: "2.1.0"}; // semver
 var d3_arraySubclass = [].__proto__?
 
 // Until ECMAScript supports array subclassing, prototype injection works well.
@@ -1780,7 +1784,7 @@ function d3_transition(groups, id) {
 
       delay <= elapsed ? start() : d3.timer(start, delay, then);
 
-      function start() {
+      function start(elapsed) {
         if (lock.active > id) return stop();
         lock.active = id;
 
@@ -1791,7 +1795,7 @@ function d3_transition(groups, id) {
         }
 
         event.start.dispatch.call(node, d, i);
-        d3.timer(tick, 0, then);
+        if (!tick(elapsed)) d3.timer(tick, 0, then);
         return 1;
       }
 
@@ -1910,12 +1914,12 @@ d3_transitionPrototype.attrTween = function(name, tween) {
   return this.tween("attr." + name, name.local ? attrTweenNS : attrTween);
 };
 d3_transitionPrototype.style = function(name, value, priority) {
-  if (arguments.length < 3) priority = null;
+  if (arguments.length < 3) priority = "";
   return this.styleTween(name, d3_transitionTween(value), priority);
 };
 
 d3_transitionPrototype.styleTween = function(name, tween, priority) {
-  if (arguments.length < 3) priority = null;
+  if (arguments.length < 3) priority = "";
   return this.tween("style." + name, function(d, i) {
     var f = tween.call(this, d, i, window.getComputedStyle(this, null).getPropertyValue(name));
     return f && function(t) {
@@ -2368,23 +2372,24 @@ d3.scale.sqrt = function() {
   return d3.scale.pow().exponent(.5);
 };
 d3.scale.ordinal = function() {
-  return d3_scale_ordinal({}, 0, {t: "range", x: []});
+  return d3_scale_ordinal([], {t: "range", x: []});
 };
 
-function d3_scale_ordinal(domain, size, ranger) {
-  var range,
+function d3_scale_ordinal(domain, ranger) {
+  var index,
+      range,
       rangeBand;
 
   function scale(x) {
-    return range[((domain[x] || (domain[x] = ++size)) - 1) % range.length];
+    return range[((index[x] || (index[x] = domain.push(x))) - 1) % range.length];
   }
 
   scale.domain = function(x) {
-    if (!arguments.length) return d3.keys(domain);
-    domain = {};
-    size = 0;
+    if (!arguments.length) return domain;
+    domain = [];
+    index = {};
     var i = -1, n = x.length, xi;
-    while (++i < n) if (!domain[xi = x[i]]) domain[xi] = ++size;
+    while (++i < n) if (!index[xi = x[i]]) index[xi] = domain.push(xi);
     return scale[ranger.t](ranger.x, ranger.p);
   };
 
@@ -2400,8 +2405,8 @@ function d3_scale_ordinal(domain, size, ranger) {
     if (arguments.length < 2) padding = 0;
     var start = x[0],
         stop = x[1],
-        step = (stop - start) / (size - 1 + padding);
-    range = size < 2 ? [(start + stop) / 2] : d3.range(start + step * padding / 2, stop + step / 2, step);
+        step = (stop - start) / (domain.length - 1 + padding);
+    range = domain.length < 2 ? [(start + stop) / 2] : d3.range(start + step * padding / 2, stop + step / 2, step);
     rangeBand = 0;
     ranger = {t: "rangePoints", x: x, p: padding};
     return scale;
@@ -2411,7 +2416,7 @@ function d3_scale_ordinal(domain, size, ranger) {
     if (arguments.length < 2) padding = 0;
     var start = x[0],
         stop = x[1],
-        step = (stop - start) / (size + padding);
+        step = (stop - start) / (domain.length + padding);
     range = d3.range(start + step * padding, stop, step);
     rangeBand = step * (1 - padding);
     ranger = {t: "rangeBands", x: x, p: padding};
@@ -2422,8 +2427,8 @@ function d3_scale_ordinal(domain, size, ranger) {
     if (arguments.length < 2) padding = 0;
     var start = x[0],
         stop = x[1],
-        step = Math.floor((stop - start) / (size + padding)),
-        err = stop - start - (size - padding) * step;
+        step = Math.floor((stop - start) / (domain.length + padding)),
+        err = stop - start - (domain.length - padding) * step;
     range = d3.range(start + Math.round(err / 2), stop, step);
     rangeBand = Math.round(step * (1 - padding));
     ranger = {t: "rangeRoundBands", x: x, p: padding};
@@ -2435,12 +2440,10 @@ function d3_scale_ordinal(domain, size, ranger) {
   };
 
   scale.copy = function() {
-    var copy = {}, x;
-    for (x in domain) copy[x] = domain[x];
-    return d3_scale_ordinal(copy, size, ranger);
+    return d3_scale_ordinal(domain, ranger);
   };
 
-  return scale[ranger.t](ranger.x, ranger.p);
+  return scale.domain(domain);
 };
 /*
  * This product includes color specifications and designs developed by Cynthia
diff --git a/d3.layout.js b/d3.layout.js
index 835aaa9d..6cc1d716 100644
--- a/d3.layout.js
+++ b/d3.layout.js
@@ -233,15 +233,15 @@ d3.layout.force = function() {
         /* Barnes-Hut criterion. */
         if ((x2 - x1) * dn < theta) {
           var k = kc * quad.count * dn * dn;
-          node.x += dx * k;
-          node.y += dy * k;
+          node.px -= dx * k;
+          node.py -= dy * k;
           return true;
         }
 
         if (quad.point && isFinite(dn)) {
           var k = kc * dn * dn;
-          node.x += dx * k;
-          node.y += dy * k;
+          node.px -= dx * k;
+          node.py -= dy * k;
         }
       }
     };
@@ -250,12 +250,13 @@ d3.layout.force = function() {
   function tick() {
     var n = nodes.length,
         m = links.length,
-        q = d3.geom.quadtree(nodes),
+        q,
         i, // current index
         o, // current object
         s, // current source
         t, // current target
         l, // current distance
+        k, // current force
         x, // x-distance
         y; // y-distance
 
@@ -270,30 +271,32 @@ d3.layout.force = function() {
         l = alpha * strengths[i] * ((l = Math.sqrt(l)) - distances[i]) / l;
         x *= l;
         y *= l;
-        t.x -= x / t.weight;
-        t.y -= y / t.weight;
-        s.x += x / s.weight;
-        s.y += y / s.weight;
+        t.x -= x * (k = s.weight / (t.weight + s.weight));
+        t.y -= y * k;
+        s.x += x * (k = 1 - k);
+        s.y += y * k;
       }
     }
 
     // apply gravity forces
-    var kg = alpha * gravity;
-    x = size[0] / 2;
-    y = size[1] / 2;
-    i = -1; while (++i < n) {
-      o = nodes[i];
-      o.x += (x - o.x) * kg;
-      o.y += (y - o.y) * kg;
+    if (k = alpha * gravity) {
+      x = size[0] / 2;
+      y = size[1] / 2;
+      i = -1; if (k) while (++i < n) {
+        o = nodes[i];
+        o.x += (x - o.x) * k;
+        o.y += (y - o.y) * k;
+      }
     }
 
-    // compute quadtree center of mass
-    d3_layout_forceAccumulate(q);
-
-    // apply charge forces
-    var kc = alpha * charge;
-    i = -1; while (++i < n) {
-      q.visit(repulse(nodes[i], kc));
+    // compute quadtree center of mass and apply charge forces
+    if (k = alpha * charge) {
+      d3_layout_forceAccumulate(q = d3.geom.quadtree(nodes));
+      i = -1; while (++i < n) {
+        if (!(o = nodes[i]).fixed) {
+          q.visit(repulse(o, k));
+        }
+      }
     }
 
     // position verlet integration
diff --git a/d3.layout.min.js b/d3.layout.min.js
index fca91d78..0deabfac 100644
--- a/d3.layout.min.js
+++ b/d3.layout.min.js
@@ -1 +1 @@
-(function(){function bc(a,b){var c=a.x+b[3],d=a.y+b[0],e=a.dx-b[1]-b[3],f=a.dy-b[0]-b[2];e<0&&(c+=e/2,e=0),f<0&&(d+=f/2,f=0);return{x:c,y:d,dx:e,dy:f}}function bb(a){return{x:a.x,y:a.y,dx:a.dx,dy:a.dy}}function ba(a,b,c){return a._tree.ancestor.parent==b.parent?a._tree.ancestor:c}function _(a,b,c){a=a._tree,b=b._tree;var d=c/(b.number-a.number);a.change+=d,b.change-=d,b.shift+=c,b.prelim+=c,b.mod+=c}function $(a){var b=0,c=0,d=a.children,e=d.length,f;while(--e>=0)f=d[e]._tree,f.prelim+=b,f.mod+=b,b+=f.shift+(c+=f.change)}function Z(a,b){function c(a,d){var e=a.children;if(e){var f,g=null,h=-1,i=e.length;while(++h<i)f=e[h],c(f,g),g=f}b(a,d)}c(a,null)}function Y(a,b){return a.depth-b.depth}function X(a,b){return b.x-a.x}function W(a,b){return a.x-b.x}function V(a,b){var c=a.children;if(c){var d,e=c.length,f=-1;while(++f<e)b(d=V(c[f],b),a)>0&&(a=d)}return a}function U(a){return a.children?a.children[a.children.length-1]:a._tree.thread}function T(a){return a.children?a.children[0]:a._tree.thread}function S(a,b){return a.parent==b.parent?1:2}function R(a){var b=a.children;return b?R(b[b.length-1]):a}function Q(a){var b=a.children;return b?Q(b[0]):a}function P(a){return a.reduce(function(a,b){return a+b.x},0)/a.length}function O(a){return 1+d3.max(a,function(a){return a.y})}function N(a,b,c){var d=b.r+c.r,e=a.r+c.r,f=b.x-a.x,g=b.y-a.y,h=Math.sqrt(f*f+g*g),i=(e*e+h*h-d*d)/(2*e*h),j=Math.acos(i),k=i*e,l=Math.sin(j)*e;f/=h,g/=h,c.x=a.x+k*f+l*g,c.y=a.y+k*g-l*f}function M(a,b,c,d){var e=a.children;a.x=b+=d*a.x,a.y=c+=d*a.y,a.r*=d;if(e){var f=-1,g=e.length;while(++f<g)M(e[f],b,c,d)}}function L(a){var b=a.children;b?(b.forEach(L),a.r=I(b)):a.r=Math.sqrt(a.value)}function K(a){delete a._pack_next,delete a._pack_prev}function J(a){a._pack_next=a._pack_prev=a}function I(a){function l(a){b=Math.min(a.x-a.r,b),c=Math.max(a.x+a.r,c),d=Math.min(a.y-a.r,d),e=Math.max(a.y+a.r,e)}var b=Infinity,c=-Infinity,d=Infinity,e=-Infinity,f=a.length,g,h,i,j,k;a.forEach(J),g=a[0],g.x=-g.r,g.y=0,l(g);if(f>1){h=a[1],h.x=h.r,h.y=0,l(h);if(f>2){i=a[2],N(g,h,i),l(i),F(g,i),g._pack_prev=i,F(i,h),h=g._pack_next;for(var m=3;m<f;m++){N(g,h,i=a[m]);var n=0,o=1,p=1;for(j=h._pack_next;j!==h;j=j._pack_next,o++)if(H(j,i)){n=1;break}if(n==1)for(k=g._pack_prev;k!==j._pack_prev;k=k._pack_prev,p++)if(H(k,i)){p<o&&(n=-1,j=k);break}n==0?(F(g,i),h=i,l(i)):n>0?(G(g,j),h=j,m--):(G(j,h),g=j,m--)}}}var q=(b+c)/2,r=(d+e)/2,s=0;for(var m=0;m<f;m++){var t=a[m];t.x-=q,t.y-=r,s=Math.max(s,t.r+Math.sqrt(t.x*t.x+t.y*t.y))}a.forEach(K);return s}function H(a,b){var c=b.x-a.x,d=b.y-a.y,e=a.r+b.r;return e*e-c*c-d*d>.001}function G(a,b){a._pack_next=b,b._pack_prev=a}function F(a,b){var c=a._pack_next;a._pack_next=b,b._pack_prev=a,b._pack_next=c,c._pack_prev=b}function E(a,b){return a.value-b.value}function C(a){return 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b=Math.sqrt(a/Math.PI);return"M0,"+b+"A"+b+","+b+" 0 1,1 0,"+ -b+"A"+b+","+b+" 0 1,1 0,"+b+"Z"},cross:function(a){var b=Math.sqrt(a/5)/2;return"M"+ -3*b+","+ -b+"H"+ -b+"V"+ -3*b+"H"+b+"V"+ -b+"H"+3*b+"V"+b+"H"+b+"V"+3*b+"H"+ -b+"V"+b+"H"+ -3*b+"Z"},diamond:function(a){var b=Math.sqrt(a/(2*cI)),c=b*cI;return"M0,"+ -b+"L"+c+",0"+" 0,"+b+" "+ -c+",0"+"Z"},square:function(a){var b=Math.sqrt(a)/2;return"M"+ -b+","+ -b+"L"+b+","+ -b+" "+b+","+b+" "+ -b+","+b+"Z"},"triangle-down":function(a){var b=Math.sqrt(a/cH),c=b*cH/2;return"M0,"+c+"L"+b+","+ -c+" "+ -b+","+ -c+"Z"},"triangle-up":function(a){var b=Math.sqrt(a/cH),c=b*cH/2;return"M0,"+ -c+"L"+b+","+c+" "+ -b+","+c+"Z"}};d3.svg.symbolTypes=d3.keys(cG);var cH=Math.sqrt(3),cI=Math.tan(30*Math.PI/180);d3.svg.axis=function(){function j(j){j.each(function(k,l,m){function F(a){return j.delay?a.transition().delay(j[m][l].delay).duration(j[m][l].duration).ease(j.ease()):a}var 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\ No newline at end of file
diff --git a/examples/force/force.js b/examples/force/force.js
index aad2d47f..fbf905e6 100644
--- a/examples/force/force.js
+++ b/examples/force/force.js
@@ -9,7 +9,8 @@ var vis = d3.select("#chart")
 
 d3.json("miserables.json", function(json) {
   var force = d3.layout.force()
-      .charge(-60)
+      .charge(-120)
+      .linkDistance(30)
       .nodes(json.nodes)
       .links(json.links)
       .size([w, h])
diff --git a/src/core/date.js b/src/compat/date.js
similarity index 100%
rename from src/core/date.js
rename to src/compat/date.js
diff --git a/src/compat/style.js b/src/compat/style.js
new file mode 100644
index 00000000..45addc2f
--- /dev/null
+++ b/src/compat/style.js
@@ -0,0 +1,9 @@
+try {
+  document.createElement("div").style.setProperty("opacity", 0, "");
+} catch (error) {
+  var d3_style_prototype = CSSStyleDeclaration.prototype,
+      d3_style_setProperty = d3_style_prototype.setProperty;
+  d3_style_prototype.setProperty = function(name, value, priority) {
+    d3_style_setProperty.call(this, name, value + "", priority);
+  };
+}
diff --git a/src/core/core.js b/src/core/core.js
index c7257cf5..ba1070fc 100644
--- a/src/core/core.js
+++ b/src/core/core.js
@@ -1 +1 @@
-d3 = {version: "2.0.4"}; // semver
+d3 = {version: "2.1.0"}; // semver
diff --git a/src/core/object.js b/src/core/object.js
deleted file mode 100644
index a284decc..00000000
--- a/src/core/object.js
+++ /dev/null
@@ -1,5 +0,0 @@
-if (!Object.create) Object.create = function(o) {
-  /** @constructor */ function f() {}
-  f.prototype = o;
-  return new f;
-};
diff --git a/src/core/transition-style.js b/src/core/transition-style.js
index def903e3..7e21269f 100644
--- a/src/core/transition-style.js
+++ b/src/core/transition-style.js
@@ -1,10 +1,10 @@
 d3_transitionPrototype.style = function(name, value, priority) {
-  if (arguments.length < 3) priority = null;
+  if (arguments.length < 3) priority = "";
   return this.styleTween(name, d3_transitionTween(value), priority);
 };
 
 d3_transitionPrototype.styleTween = function(name, tween, priority) {
-  if (arguments.length < 3) priority = null;
+  if (arguments.length < 3) priority = "";
   return this.tween("style." + name, function(d, i) {
     var f = tween.call(this, d, i, window.getComputedStyle(this, null).getPropertyValue(name));
     return f && function(t) {
diff --git a/src/core/transition.js b/src/core/transition.js
index 04d2ef9b..dd756469 100644
--- a/src/core/transition.js
+++ b/src/core/transition.js
@@ -39,7 +39,7 @@ function d3_transition(groups, id) {
 
       delay <= elapsed ? start() : d3.timer(start, delay, then);
 
-      function start() {
+      function start(elapsed) {
         if (lock.active > id) return stop();
         lock.active = id;
 
@@ -50,7 +50,7 @@ function d3_transition(groups, id) {
         }
 
         event.start.dispatch.call(node, d, i);
-        d3.timer(tick, 0, then);
+        if (!tick(elapsed)) d3.timer(tick, 0, then);
         return 1;
       }
 
diff --git a/src/geo/albers.js b/src/geo/albers.js
index 88bffdbe..0d002354 100644
--- a/src/geo/albers.js
+++ b/src/geo/albers.js
@@ -21,6 +21,18 @@ d3.geo.albers = function() {
     ];
   }
 
+  albers.invert = function(coordinates) {
+    var x = (coordinates[0] - translate[0]) / scale,
+        y = (coordinates[1] - translate[1]) / scale,
+        p0y = p0 + y,
+        t = Math.atan2(x, p0y),
+        p = Math.sqrt(x * x + p0y * p0y);
+    return [
+      (lng0 + t / n) / d3_radians,
+      Math.asin((C - p * p * n * n) / (2 * n)) / d3_radians
+    ];
+  };
+
   function reload() {
     var phi1 = d3_radians * parallels[0],
         phi2 = d3_radians * parallels[1],
diff --git a/src/geo/azimuthal.js b/src/geo/azimuthal.js
index 92943480..495c9f62 100644
--- a/src/geo/azimuthal.js
+++ b/src/geo/azimuthal.js
@@ -16,7 +16,7 @@ d3.geo.azimuthal = function() {
         sx1 = Math.sin(x1),
         cy1 = Math.cos(y1),
         sy1 = Math.sin(y1),
-        k = mode == "stereographic" ? 1 / (1 + sy0 * sy1 + cy0 * cy1 * cx1) : 1,
+        k = mode === "stereographic" ? 1 / (1 + sy0 * sy1 + cy0 * cy1 * cx1) : 1,
         x = k * cy1 * sx1,
         y = k * (sy0 * cy1 * cx1 - cy0 * sy1);
     return [
@@ -25,9 +25,22 @@ d3.geo.azimuthal = function() {
     ];
   }
 
+  azimuthal.invert = function(coordinates) {
+    var x = (coordinates[0] - translate[0]) / scale,
+        y = (coordinates[1] - translate[1]) / scale,
+        p = Math.sqrt(x * x + y * y),
+        c = mode === "stereographic" ? 2 * Math.atan(p) : Math.asin(p),
+        sc = Math.sin(c),
+        cc = Math.cos(c);
+    return [
+      (x0 + Math.atan2(x * sc, p * cy0 * cc + y * sy0 * sc)) / d3_radians,
+      Math.asin(cc * sy0 - (y * sc * cy0) / p) / d3_radians
+    ];
+  };
+
   azimuthal.mode = function(x) {
     if (!arguments.length) return mode;
-    mode = x;
+    mode = x + "";
     return azimuthal;
   };
 
diff --git a/src/geo/greatCircle.js b/src/geo/greatCircle.js
new file mode 100644
index 00000000..a5408267
--- /dev/null
+++ b/src/geo/greatCircle.js
@@ -0,0 +1,91 @@
+// From http://williams.best.vwh.net/avform.htm#Intermediate
+d3.geo.greatCircle = function() {
+  var source = d3_geo_greatCircleSource,
+      target = d3_geo_greatCircleTarget,
+      n = 100,
+      radius = 6371; // Mean radius of Earth, in km.
+  // TODO: breakAtDateLine?
+
+  function greatCircle(d, i) {
+    var from = source.call(this, d, i),
+        to = target.call(this, d, i),
+        x0 = from[0] * d3_radians,
+        y0 = from[1] * d3_radians,
+        x1 = to[0] * d3_radians,
+        y1 = to[1] * d3_radians,
+        cx0 = Math.cos(x0), sx0 = Math.sin(x0),
+        cy0 = Math.cos(y0), sy0 = Math.sin(y0),
+        cx1 = Math.cos(x1), sx1 = Math.sin(x1),
+        cy1 = Math.cos(y1), sy1 = Math.sin(y1),
+        d = Math.acos(sy0 * sy1 + cy0 * cy1 * Math.cos(x1 - x0)),
+        sd = Math.sin(d),
+        f = d / (n - 1),
+        e = -f,
+        path = [],
+        i = -1;
+
+    while (++i < n) {
+      e += f;
+      var A = Math.sin(d - e) / sd,
+          B = Math.sin(e) / sd,
+          x = A * cy0 * cx0 + B * cy1 * cx1,
+          y = A * cy0 * sx0 + B * cy1 * sx1,
+          z = A * sy0       + B * sy1;
+      path[i] = [
+        Math.atan2(y, x) / d3_radians,
+        Math.atan2(z, Math.sqrt(x * x + y * y)) / d3_radians
+      ];
+    }
+
+    return path;
+  }
+
+  greatCircle.source = function(x) {
+    if (!arguments.length) return source;
+    source = x;
+    return greatCircle;
+  };
+
+  greatCircle.target = function(x) {
+    if (!arguments.length) return target;
+    target = x;
+    return greatCircle;
+  };
+
+  greatCircle.n = function(x) {
+    if (!arguments.length) return n;
+    n = +x;
+    return greatCircle;
+  };
+
+  greatCircle.radius = function(x) {
+    if (!arguments.length) return radius;
+    radius = +x;
+    return greatCircle;
+  };
+
+  // Haversine formula for great-circle distance.
+  greatCircle.distance = function(d, i) {
+    var from = source.call(this, d, i),
+        to = target.call(this, d, i),
+        x0 = from[0] * d3_radians,
+        y0 = from[1] * d3_radians,
+        x1 = to[0] * d3_radians,
+        y1 = to[1] * d3_radians,
+        sy = Math.sin((y1 - y0) / 2),
+        sx = Math.sin((x1 - x0) / 2),
+        a = sy * sy + Math.cos(y0) * Math.cos(y1) * sx * sx;
+
+    return radius * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+  };
+
+  return greatCircle;
+};
+
+function d3_geo_greatCircleSource(d) {
+  return d.source;
+}
+
+function d3_geo_greatCircleTarget(d) {
+  return d.target;
+}
diff --git a/src/geo/mercator.js b/src/geo/mercator.js
index 9494d711..dea7ca62 100644
--- a/src/geo/mercator.js
+++ b/src/geo/mercator.js
@@ -3,14 +3,23 @@ d3.geo.mercator = function() {
       translate = [480, 250];
 
   function mercator(coordinates) {
-    var x = (coordinates[0]) / 360,
-        y = (-180 / Math.PI * Math.log(Math.tan(Math.PI / 4 + coordinates[1] * Math.PI / 360))) / 360;
+    var x = coordinates[0] / 360,
+        y = -(Math.log(Math.tan(Math.PI / 4 + coordinates[1] * d3_radians / 2)) / d3_radians) / 360;
     return [
       scale * x + translate[0],
       scale * Math.max(-.5, Math.min(.5, y)) + translate[1]
     ];
   }
 
+  mercator.invert = function(coordinates) {
+    var x = (coordinates[0] - translate[0]) / scale,
+        y = (coordinates[1] - translate[1]) / scale;
+    return [
+      360 * x,
+      2 * Math.atan(Math.exp(-360 * y * d3_radians)) / d3_radians - 90
+    ];
+  };
+
   mercator.scale = function(x) {
     if (!arguments.length) return scale;
     scale = +x;
diff --git a/src/layout/force.js b/src/layout/force.js
index 544bc463..8ecee9c3 100644
--- a/src/layout/force.js
+++ b/src/layout/force.js
@@ -27,15 +27,15 @@ d3.layout.force = function() {
         /* Barnes-Hut criterion. */
         if ((x2 - x1) * dn < theta) {
           var k = kc * quad.count * dn * dn;
-          node.x += dx * k;
-          node.y += dy * k;
+          node.px -= dx * k;
+          node.py -= dy * k;
           return true;
         }
 
         if (quad.point && isFinite(dn)) {
           var k = kc * dn * dn;
-          node.x += dx * k;
-          node.y += dy * k;
+          node.px -= dx * k;
+          node.py -= dy * k;
         }
       }
     };
@@ -44,12 +44,13 @@ d3.layout.force = function() {
   function tick() {
     var n = nodes.length,
         m = links.length,
-        q = d3.geom.quadtree(nodes),
+        q,
         i, // current index
         o, // current object
         s, // current source
         t, // current target
         l, // current distance
+        k, // current force
         x, // x-distance
         y; // y-distance
 
@@ -64,30 +65,32 @@ d3.layout.force = function() {
         l = alpha * strengths[i] * ((l = Math.sqrt(l)) - distances[i]) / l;
         x *= l;
         y *= l;
-        t.x -= x / t.weight;
-        t.y -= y / t.weight;
-        s.x += x / s.weight;
-        s.y += y / s.weight;
+        t.x -= x * (k = s.weight / (t.weight + s.weight));
+        t.y -= y * k;
+        s.x += x * (k = 1 - k);
+        s.y += y * k;
       }
     }
 
     // apply gravity forces
-    var kg = alpha * gravity;
-    x = size[0] / 2;
-    y = size[1] / 2;
-    i = -1; while (++i < n) {
-      o = nodes[i];
-      o.x += (x - o.x) * kg;
-      o.y += (y - o.y) * kg;
+    if (k = alpha * gravity) {
+      x = size[0] / 2;
+      y = size[1] / 2;
+      i = -1; if (k) while (++i < n) {
+        o = nodes[i];
+        o.x += (x - o.x) * k;
+        o.y += (y - o.y) * k;
+      }
     }
 
-    // compute quadtree center of mass
-    d3_layout_forceAccumulate(q);
-
-    // apply charge forces
-    var kc = alpha * charge;
-    i = -1; while (++i < n) {
-      q.visit(repulse(nodes[i], kc));
+    // compute quadtree center of mass and apply charge forces
+    if (k = alpha * charge) {
+      d3_layout_forceAccumulate(q = d3.geom.quadtree(nodes));
+      i = -1; while (++i < n) {
+        if (!(o = nodes[i]).fixed) {
+          q.visit(repulse(o, k));
+        }
+      }
     }
 
     // position verlet integration
diff --git a/src/scale/ordinal.js b/src/scale/ordinal.js
index 19d7d481..09fac56c 100644
--- a/src/scale/ordinal.js
+++ b/src/scale/ordinal.js
@@ -1,21 +1,22 @@
 d3.scale.ordinal = function() {
-  return d3_scale_ordinal({}, 0, {t: "range", x: []});
+  return d3_scale_ordinal([], {t: "range", x: []});
 };
 
-function d3_scale_ordinal(domain, size, ranger) {
-  var range,
+function d3_scale_ordinal(domain, ranger) {
+  var index,
+      range,
       rangeBand;
 
   function scale(x) {
-    return range[((domain[x] || (domain[x] = ++size)) - 1) % range.length];
+    return range[((index[x] || (index[x] = domain.push(x))) - 1) % range.length];
   }
 
   scale.domain = function(x) {
-    if (!arguments.length) return d3.keys(domain);
-    domain = {};
-    size = 0;
+    if (!arguments.length) return domain;
+    domain = [];
+    index = {};
     var i = -1, n = x.length, xi;
-    while (++i < n) if (!domain[xi = x[i]]) domain[xi] = ++size;
+    while (++i < n) if (!index[xi = x[i]]) index[xi] = domain.push(xi);
     return scale[ranger.t](ranger.x, ranger.p);
   };
 
@@ -31,8 +32,8 @@ function d3_scale_ordinal(domain, size, ranger) {
     if (arguments.length < 2) padding = 0;
     var start = x[0],
         stop = x[1],
-        step = (stop - start) / (size - 1 + padding);
-    range = size < 2 ? [(start + stop) / 2] : d3.range(start + step * padding / 2, stop + step / 2, step);
+        step = (stop - start) / (domain.length - 1 + padding);
+    range = domain.length < 2 ? [(start + stop) / 2] : d3.range(start + step * padding / 2, stop + step / 2, step);
     rangeBand = 0;
     ranger = {t: "rangePoints", x: x, p: padding};
     return scale;
@@ -42,7 +43,7 @@ function d3_scale_ordinal(domain, size, ranger) {
     if (arguments.length < 2) padding = 0;
     var start = x[0],
         stop = x[1],
-        step = (stop - start) / (size + padding);
+        step = (stop - start) / (domain.length + padding);
     range = d3.range(start + step * padding, stop, step);
     rangeBand = step * (1 - padding);
     ranger = {t: "rangeBands", x: x, p: padding};
@@ -53,8 +54,8 @@ function d3_scale_ordinal(domain, size, ranger) {
     if (arguments.length < 2) padding = 0;
     var start = x[0],
         stop = x[1],
-        step = Math.floor((stop - start) / (size + padding)),
-        err = stop - start - (size - padding) * step;
+        step = Math.floor((stop - start) / (domain.length + padding)),
+        err = stop - start - (domain.length - padding) * step;
     range = d3.range(start + Math.round(err / 2), stop, step);
     rangeBand = Math.round(step * (1 - padding));
     ranger = {t: "rangeRoundBands", x: x, p: padding};
@@ -66,10 +67,8 @@ function d3_scale_ordinal(domain, size, ranger) {
   };
 
   scale.copy = function() {
-    var copy = {}, x;
-    for (x in domain) copy[x] = domain[x];
-    return d3_scale_ordinal(copy, size, ranger);
+    return d3_scale_ordinal(domain, ranger);
   };
 
-  return scale[ranger.t](ranger.x, ranger.p);
+  return scale.domain(domain);
 };
diff --git a/test/core/selection-style-test.js b/test/core/selection-style-test.js
index 680056e0..83090dc2 100644
--- a/test/core/selection-style-test.js
+++ b/test/core/selection-style-test.js
@@ -17,7 +17,7 @@ suite.addBatch({
     },
     "sets a property as a number": function(body) {
       body.style("opacity", .3);
-      assert.equal(document.body.style["opacity"], ".3");
+      assert.equal(document.body.style["opacity"], "0.3");
     },
     "sets a property as a function": function(body) {
       body.style("background-color", function() { return "orange"; });
@@ -57,8 +57,8 @@ suite.addBatch({
     },
     "sets a property as a number": function(div) {
       div.style("opacity", .5);
-      assert.equal(div[0][0].style["opacity"], ".5");
-      assert.equal(div[0][1].style["opacity"], ".5");
+      assert.equal(div[0][0].style["opacity"], "0.5");
+      assert.equal(div[0][1].style["opacity"], "0.5");
     },
     "sets a property as a function": function(div) {
       div.style("background-color", d3.interpolateRgb("orange", "yellow"));
diff --git a/test/env.js b/test/env.js
index cfbdefad..be0cadeb 100644
--- a/test/env.js
+++ b/test/env.js
@@ -1,6 +1,7 @@
 document = require("jsdom").jsdom("<html><head></head><body></body></html>");
 window = document.createWindow();
 navigator = window.navigator;
+CSSStyleDeclaration = window.CSSStyleDeclaration;
 
 require("../lib/sizzle/sizzle");
 Sizzle = window.Sizzle;
diff --git a/test/geo/albers-test.js b/test/geo/albers-test.js
new file mode 100644
index 00000000..afcde0cc
--- /dev/null
+++ b/test/geo/albers-test.js
@@ -0,0 +1,57 @@
+require("../env");
+require("../../d3");
+require("../../d3.geo");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("d3.geo.albers");
+
+suite.addBatch({
+  "albers": {
+    topic: function() {
+      return d3.geo.albers();
+    },
+    "Arctic": function(albers) {
+      var coords = albers([0, 85]);
+      assert.inDelta(coords[0], 1031.393796, 1e-6);
+      assert.inDelta(coords[1], -714.160436, 1e-6);
+      var lonlat = albers.invert(coords);
+      assert.inDelta(lonlat[0], 0, 1e-6);
+      assert.inDelta(lonlat[1], 85, 1e-6);
+    },
+    "Antarctic": function(albers) {
+      var coords = albers([0, -85]);
+      assert.inDelta(coords[0], 2753.458335, 1e-6);
+      assert.inDelta(coords[1],  317.371122, 1e-6);
+      var lonlat = albers.invert(coords);
+      assert.inDelta(lonlat[0], 0, 1e-6);
+      assert.inDelta(lonlat[1], -85, 1e-6);
+    },
+    "Hawaii": function(albers) {
+      var coords = albers([-180, 0]);
+      assert.inDelta(coords[0], -984.779405, 1e-6);
+      assert.inDelta(coords[1],  209.571197, 1e-6);
+      var lonlat = albers.invert(coords);
+      assert.inDelta(lonlat[0], -180, 1e-6);
+      assert.inDelta(lonlat[1], 0, 1e-6);
+    },
+    "Phillipines": function(albers) {
+      var coords = albers([180, 0]);
+      assert.inDelta(coords[0],   894.435228, 1e-6);
+      assert.inDelta(coords[1], -2927.636630, 1e-6);
+      var lonlat = albers.invert(coords);
+      assert.inDelta(lonlat[0], 180, 1e-6);
+      assert.inDelta(lonlat[1], 0, 1e-6);
+    },
+    "Inversion works for non-zero translation": function() {
+      var albers = d3.geo.albers().translate([123, 99]).scale(100),
+          coords = albers([0, 85]),
+          lonlat = albers.invert(coords);
+      assert.inDelta(lonlat[0], 0, 1e-6);
+      assert.inDelta(lonlat[1], 85, 1e-6);
+    }
+  }
+});
+
+suite.export(module);
diff --git a/test/geo/azimuthal-test.js b/test/geo/azimuthal-test.js
new file mode 100644
index 00000000..43563a39
--- /dev/null
+++ b/test/geo/azimuthal-test.js
@@ -0,0 +1,89 @@
+require("../env");
+require("../../d3");
+require("../../d3.geo");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("d3.geo.azimuthal");
+
+suite.addBatch({
+  "azimuthal.stereographic": {
+    topic: function() {
+      return d3.geo.azimuthal().mode("stereographic").translate([0, 0]).scale(100);
+    },
+    "Arctic": function(azimuthal) {
+      var coords = azimuthal([0, 85]);
+      assert.inDelta(coords[0], 0, 1e-6);
+      assert.inDelta(coords[1], -91.633117, 1e-6);
+      var lonlat = azimuthal.invert(coords);
+      assert.inDelta(lonlat[0], 0, 1e-6);
+      assert.inDelta(lonlat[1], 85, 1e-6);
+    },
+    "Antarctic": function(azimuthal) {
+      var coords = azimuthal([0, -85]);
+      assert.inDelta(coords[0], 0, 1e-6);
+      assert.inDelta(coords[1], 91.633117, 1e-6);
+      var lonlat = azimuthal.invert(coords);
+      assert.inDelta(lonlat[0], 0, 1e-6);
+      assert.inDelta(lonlat[1], -85, 1e-6);
+    },
+    "Hawaii": function(azimuthal) {
+      var coords = azimuthal([-180, 0]);
+      assert.equal(coords[0], -Infinity);
+      assert.isTrue(isNaN(coords[1]));
+    },
+    "Phillipines": function(azimuthal) {
+      var coords = azimuthal([180, 0]);
+      assert.equal(coords[0], Infinity);
+      assert.isTrue(isNaN(coords[1]));
+    },
+    "Inversion works for non-zero translation": function() {
+      var azimuthal = d3.geo.azimuthal().mode("stereographic").translate([123, 99]).scale(100),
+          coords = azimuthal([0, 85]),
+          lonlat = azimuthal.invert(coords);
+      assert.inDelta(lonlat[0], 0, 1e-6);
+      assert.inDelta(lonlat[1], 85, 1e-6);
+    }
+  },
+  "azimuthal.orthographic": {
+    topic: function() {
+      return d3.geo.azimuthal().mode("orthographic").translate([0, 0]).scale(100);
+    },
+    "Arctic": function(azimuthal) {
+      var coords = azimuthal([0, 85]);
+      assert.inDelta(coords[0], 0, 1e-6);
+      assert.inDelta(coords[1], -99.619469, 1e-6);
+      var lonlat = azimuthal.invert(coords);
+      assert.inDelta(lonlat[0], 0, 1e-6);
+      assert.inDelta(lonlat[1], 85, 1e-6);
+    },
+    "Antarctic": function(azimuthal) {
+      var coords = azimuthal([0, -85]);
+      assert.inDelta(coords[0], 0, 1e-6);
+      assert.inDelta(coords[1], 99.619469, 1e-6);
+      var lonlat = azimuthal.invert(coords);
+      assert.inDelta(lonlat[0], 0, 1e-6);
+      assert.inDelta(lonlat[1], -85, 1e-6);
+    },
+    "Hawaii": function(azimuthal) {
+      var coords = azimuthal([-180, 0]);
+      assert.inDelta(coords[0], 0, 1e-6);
+      assert.inDelta(coords[1], 0, 1e-6);
+    },
+    "Phillipines": function(azimuthal) {
+      var coords = azimuthal([180, 0]);
+      assert.inDelta(coords[0], 0, 1e-6);
+      assert.inDelta(coords[1], 0, 1e-6);
+    },
+    "Inversion works for non-zero translation": function() {
+      var azimuthal = d3.geo.azimuthal().mode("orthographic").translate([123, 99]).scale(100),
+          coords = azimuthal([0, 85]),
+          lonlat = azimuthal.invert(coords);
+      assert.inDelta(lonlat[0], 0, 1e-6);
+      assert.inDelta(lonlat[1], 85, 1e-6);
+    }
+  }
+});
+
+suite.export(module);
diff --git a/test/geo/greatCircle-test.js b/test/geo/greatCircle-test.js
new file mode 100644
index 00000000..085d5df7
--- /dev/null
+++ b/test/geo/greatCircle-test.js
@@ -0,0 +1,42 @@
+require("../env");
+require("../../d3");
+require("../../d3.geo");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("d3.geo.greatCircle");
+
+suite.addBatch({
+  "greatCircle": {
+    topic: function() {
+      return d3.geo.greatCircle()
+          .n(12);
+    },
+    "distance": function(circle) {
+      assert.equal(circle.distance({source: [0, 0], target: [0, 0]}), 0);
+      assert.inDelta(circle.distance({
+        source: [118 + 24 / 60, 33 + 57 / 60],
+        target: [ 73 + 47 / 60, 40 + 38 / 60]
+      }), 3973, .5);
+    },
+    "geodesic": function(circle) {
+      assert.inDelta(circle({source: [5, 52], target: [-120, 37]}), [
+        [   5,        52      ],
+        [  -3.805036, 57.05083],
+        [ -15.122869, 61.30118],
+        [ -29.396213, 64.34584],
+        [ -46.132729, 65.72409],
+        [ -63.394401, 65.15597],
+        [ -78.854311, 62.76337],
+        [ -91.401599, 58.96701],
+        [-101.190927, 54.21333],
+        [-108.843633, 48.83586],
+        [-114.961152, 43.05231],
+        [-120,        37      ]
+      ], .5);
+    }
+  }
+});
+
+suite.export(module);
diff --git a/test/geo/mercator-test.js b/test/geo/mercator-test.js
new file mode 100644
index 00000000..8970ffef
--- /dev/null
+++ b/test/geo/mercator-test.js
@@ -0,0 +1,57 @@
+require("../env");
+require("../../d3");
+require("../../d3.geo");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("d3.geo.mercator");
+
+suite.addBatch({
+  "mercator": {
+    topic: function() {
+      return d3.geo.mercator().translate([0, 0]).scale(100);
+    },
+    "Arctic": function(mercator) {
+      var coords = mercator([0, 85]);
+      assert.inDelta(coords[0], 0, 1e-6);
+      assert.inDelta(coords[1], -49.8362085, 1e-6);
+      var lonlat = mercator.invert(coords);
+      assert.inDelta(lonlat[0], 0, 1e-6);
+      assert.inDelta(lonlat[1], 85, 1e-6);
+    },
+    "Antarctic": function(mercator) {
+      var coords = mercator([0, -85]);
+      assert.inDelta(coords[0], 0, 1e-6);
+      assert.inDelta(coords[1], 49.8362085, 1e-6);
+      var lonlat = mercator.invert(coords);
+      assert.inDelta(lonlat[0], 0, 1e-6);
+      assert.inDelta(lonlat[1], -85, 1e-6);
+    },
+    "Hawaii": function(mercator) {
+      var coords = mercator([-180, 0]);
+      assert.inDelta(coords[0], -50, 1e-6);
+      assert.inDelta(coords[1], 0, 1e-6);
+      var lonlat = mercator.invert(coords);
+      assert.inDelta(lonlat[0], -180, 1e-6);
+      assert.inDelta(lonlat[1], 0, 1e-6);
+    },
+    "Phillipines": function(mercator) {
+      var coords = mercator([180, 0]);
+      assert.inDelta(coords[0], 50, 1e-6);
+      assert.inDelta(coords[1], 0, 1e-6);
+      var lonlat = mercator.invert(coords);
+      assert.inDelta(lonlat[0], 180, 1e-6);
+      assert.inDelta(lonlat[1], 0, 1e-6);
+    },
+    "Inversion works for non-zero translation": function() {
+      var mercator = d3.geo.mercator().translate([123, 99]).scale(100),
+          coords = mercator([0, 85]),
+          lonlat = mercator.invert(coords);
+      assert.inDelta(lonlat[0], 0, 1e-6);
+      assert.inDelta(lonlat[1], 85, 1e-6);
+    }
+  }
+});
+
+suite.export(module);
diff --git a/test/scale/ordinal-test.js b/test/scale/ordinal-test.js
index bac05347..eb3a9207 100644
--- a/test/scale/ordinal-test.js
+++ b/test/scale/ordinal-test.js
@@ -29,17 +29,39 @@ suite.addBatch({
         var x = ordinal().range(["foo", "bar"]);
         assert.equal(x(1), "foo");
         assert.equal(x(0), "bar");
-        assert.deepEqual(x.domain(), ["0", "1"]);
+        assert.deepEqual(x.domain(), [1, 0]);
         x.domain(["0", "1"]);
         assert.equal(x(0), "foo"); // it changed!
         assert.equal(x(1), "bar");
         assert.deepEqual(x.domain(), ["0", "1"]);
       },
-      "coerces domain values to strings": function(ordinal) {
+      "uniqueness is based on string coercion": function(ordinal) {
+        var x = ordinal().domain(["foo"]).range([42, 43, 44]);
+        assert.equal(x(new String("foo")), 42);
+        assert.equal(x({toString: function() { return "foo"; }}), 42);
+        assert.equal(x({toString: function() { return "bar"; }}), 43);
+      },
+      "orders domain values by the order in which they are seen": function(ordinal) {
+        var x = ordinal();
+        x("foo");
+        x("bar");
+        x("baz");
+        assert.deepEqual(x.domain(), ["foo", "bar", "baz"]);
+        x.domain(["baz", "bar"]);
+        x("foo");
+        assert.deepEqual(x.domain(), ["baz", "bar", "foo"]);
+        x.domain(["baz", "foo"]);
+        assert.deepEqual(x.domain(), ["baz", "foo"]);
+        x.domain([]);
+        x("foo");
+        x("bar");
+        assert.deepEqual(x.domain(), ["foo", "bar"]);
+      },
+      "does not coerce domain values to strings": function(ordinal) {
         var x = ordinal().domain([0, 1]);
-        assert.deepEqual(x.domain(), ["0", "1"]);
-        assert.typeOf(x.domain()[0], "string");
-        assert.typeOf(x.domain()[1], "string");
+        assert.deepEqual(x.domain(), [0, 1]);
+        assert.typeOf(x.domain()[0], "number");
+        assert.typeOf(x.domain()[1], "number");
       }
     },