Leap Motion Gesture Control
The future is here. Control your computer with motion. The Leap Motion Controller aims to recreate anything you can do with a touch screen, but without touching the screen.
It tracks your hand and finger movements in three-dimensional space, allowing you to recreate multitouch input without actually touching anything. You just wave your hands and wiggle your fingers in the air over it and like magic, your computer responds.
Amazingly this isn't a concept or prototype, this wonderful piece of gadgetry is here from 29th July for $80. It's available for Windows 7 and 8 as well as Mac OS X 10.6 and above.
See Leap Motion for more information.