Pretty interesting. Students at Georgia Tech created a game that maps a 3D view onto whatever the camera in the phone-like device is seeing.
ARhrrrr is an augmented reality shooter for mobile camera-phones. The phone provides a window into a 3d town overrun with zombies. Point the camera at our special game map to mix virtual and real world content. Civilians are trapped in the town, and must escape before the zombies eat them! From your vantage point in a helicopter overhead, you must shoot the zombies to clear the path for the civilians to get out. Watch out though as the zombies will fight back, throwing bloody organs to bring down your copter. Move the phone quickly to dodge them. You can also use Skittles as tangible inputs to the game, placing one on the board and shooting it to trigger an explosion.
They produced a nice video too…