Application with using Cocos2d game engine for HTML5 (Java Scripit) with Shape Cashe class for PhysicsEditor (http://www.codeandweb.com/physicseditor)
box2d/GB2ShapeCache.js - shape cashe class
TestBox2d/src/GameField.js method:createBodyAndSprite:function (position) - example how to use Shape Cashe
We created this class for Ludum Dare 24 for our game "Cow" - http://www.ludumdare.com/compo/ludum-dare-24/?action=preview&uid=16595