Here is a pretty cool Kinect hack using the Kinect beta SDK and a Windows Phone.
The demo uses a simple game engine utilizing the pseudo-holographic effect. A Kinect "sees" the position of the viewer and the 3D engine adjusts the image accordingly to give the illusion of a real 3D object. The 3D engine supports anaglyph 3D (red/cyan glasses) for a better effect in real life.
A simple WP7 app controls the application and the helicopter using the accelerometers of the phone.
See more great demos at Programming4Funâ€™s channel here.