Pocket Physics v0.2 is out! Main new feature: Pins!

You can design scenes freely by drawing things with the stylus. Things can be solid, like ramps and floors, or dynamic, like balls or boxes. Like in The Incredible Machine, you can reset the scene, change it, and start the simulation again. It’s even more fun if you have a DS Motion, which can be used to control gravity!

http://blog.dev-scene.com/0xtob/2008/01/03/pocket-physics-v02-now-with-pins/