LEAPMOTION

This thing is the coolest invention I've ever seen. I want it so bad and I am planning on getting it for my brother-in-law for Christmas. It's called the Leap motion. It's a little box that connects to any computer and turns it into a 3D touch screen, but you don't touch anything. It's like the Kinect for Xbox but 200x more accurate and you can use it for everything on the computer. Things as accurate as a signature. It detects your hands and fingers down to 1/100th of a millimeter.
http://leapmotion.com/