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The project is already finished, but has interesting possibilities such as the "cybercarpet"

GestureTek, creates interactive displays for TV weathermen, museums, and hotels using three-dimensional cameras that can distinguish the hand movements of users. From a soft punch up into the air to turn on the TV, to a twist of the hand to change channels, or raising the volume with an upward pat, these simple gestures can be detected by the cameras and interpreted by specially-designed computer chips.

New Interface Technology Realizes 'Touchable' 3-D Images

You Are the Controller.

Introducing Project Natal, a revolutionary new way to play: no controller required.  See a ball? Kick it, hit it, trap it or catch it.  If you know how to move your hands, shake your hips or speak you and your friends can jump into the fun -- the only experience needed is life experience.

TeslaTouch infuses finger-driven interfaces with physical feedback. The technology is based on the electrovibration principle, which can programmatically vary the electrostatic friction between fingers and a touch panel. Importantly, there are no moving parts, unlike most tactile feedback technologies, which use vibration motors. This allows for different fingers to feel different sensations.