Leap Motion - $70 3D motion tracking on your computer

Actually, Apple should buy this company and integrate this thing above the trackpad on mac laptops...

The only thing I'd be concerned about is arm strain that results from holding your hands in the air like that. After a few minutes, its probably pretty uncomfortable. Does this work even if you rest your elbows on the desk? I assume it would, but the question of arm strain and comfort is the only thing I wonder about.

All I see are a blank grey surface and boasts.

Kinect may have been sufficiently advanced that the media regarded it as magic, but as an high-speed parallax-based IR laser projector rangefinder coupled to a webcam, it's built of real devices with real performance specifications and limitations. This company has a credibility problem, especially with their grandiose claims of precision.

If yes - then this will be heaven for someone "sniffing" passwords.