Wow I remember when I first saw Microsoft Kinect, I was wowed by the technology on display and here is another interpretation of motion sensing for your computer, Leap. This is what the description on the YouTube video about it says:
Leap represents an entirely new way to interact with your computers. It’s more accurate than a mouse, as reliable as a keyboard and more sensitive than a touchscreen. For the first time, you can control a computer in three dimensions with your natural hand and finger movements.
Leap claims its technology is accurate down to a 1/100th of a millimetre. It tracking movement through 8 cubic feet, according to the company and is sensitive enough to discern fingers, hands, and handheld objects.
A demonstration video, embedded below, shows that the Leap can be used from anything from navigating maps to even playing first-person shooter games. At only $70 bucks, and it being a USB device I will be on it as soon as I can, I hope it works with Windows 8.
Here is the video, it looks like a sibling of a Mac: