In the last Kinect hack, developers have managed to tap into the hardware with impressive results, and have ported the popular DaVinci experience to the Kinect platform.
"We've seen applications ranging from gesture-based experiences to 3D imaging.We've taken this exciting opportunity to port our popular DaVinci experience to the Kinect platform. Gestures are used to create objects and control the physics of the environment. Your hands appear in the interface which allows you to literally grab objects out of thin air and move them in the environment. Additional gestures allow you to affect the gravity, magnetism and "planetary attraction"."