Intel has a Perceptual Computing Challenge going for their kinect-like webcam and the Space Invaders project a friend and I’ve been developing got through to the second stage. This is a project that we have tried making on several platforms and interfaces, but the original idea persists: remake the classic game in 3D, where you are the controller and the invaders and their space is as big and immersive as possible. Below a short video from the beta.
And here is a video from our alpha stage with the kinect a year or two ago.