Box2d Flash Alchemy Port + World Construction Kit

This looks really good and really fast.

World Construction Kit is is 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. Documentation located on the GitHub wiki page..”

Sideroller is a nice game in development using it, the whole game is on a wheel.