Celluon CL-800BT laser keyboard at CeBIT 2008

This is actually an amazing device to see demonstrated for real. It projects a red laser keyboard on the table, detects touches using a detector and a camera. It actually works pretty well, and it can also function as a mouse, which I thought was impressive. Battery life is 220 minutes.
You can watch this video in HD quality at http://techvideoblog.com/cebit/celluon-cl-800bt/