GestPoint demonstrated their upcoming XBox 360 Eye-Toy cameras at E3 today. They used two cameras to detect motion in 3-D space. Players control on screen objects with their finger or other body parts — up, down, left, right, in, and out. Video clip after the jump.
This can also be used in public terminals as a replacement for a mouse. Minority Report-like screens can be had in your own living room.