Austrian GoMonkey revealed their gesture based interaction platform at the CeBIT 2006.

I had the pleasure to see the GoMonkey system already about a year ago at an investor meeting. Now the startup scored German national TV coverage for their Minority Report like User interface. You sure remember Tom Cruise standing in front of a huge screen and move elements around with gestures in the movie Minority Report. He wore gloves, which is already totally outdated.
The GoMonkey system uses two cameras to capture the gestures of users in 3D. Users can navigate with natural hand movements through menus and hierarchies.
The current version uses the Sun Java 3D UI called Looking Glass. The system runs on standard hardware combined with back projection beamers. Applications for GoMonkey are in presentation/collaboration rooms, interactive advertisement and events.
GoMonkey can be easily customized for specific solutions. You can see a GoMonkey in action in the 3Sat Neues TV show video stream (click Web-TV thumb on the right, the segment showing GoMonkey start at 20:50min.). More details on the GoMonkey site.