Jesse Sternberg at sideroller.com has created the World Construction Kit, a toolset/framework for rapidly developing physics based games / websites within the Flash IDE. WCK allows you to layout your 2d worlds / game levels entirely within Flash and have them hook into the physics simulation without writing any code.
Have a go at the game. Click “Next Demo” then use the arrow keys:
The kit is damn cool. You can lay out your Box2D physics worlds within the Flash IDE and also use the component inspector to configure the shapes. Easy-peasy.
He’s also created the Box2D Flash Alchemy Port. An AS3 interface to the Box2D C++ 2D physics engine compiled with Adobe Alchemy. Documentation located on his GitHub wiki page.