Well, this looks interesting. A device approximately the size of a pack of gum can pick up your movements in 3D space and allow you to control what happens on-screen. All for approximately $70. They're set to roll out at the end of this year, and can be preordered now.
The company is claiming that their software can be embedded into almost anything with an on-board computer, including smartphones and refrigerators. The device tracks all of your ten fingers simultaneously to within 1/100th of a millimeter. You can also hook up multiple of these devices to increase your work space.
I'm not exactly sure what, say, typing on computer would look like with this sort of device, but it's the first device of its kind that I've seen thus far which actually seems like a practicel shift in UI. I can see how this would be a much more intuitive way to, say, move a 3D model around in space. Various programs have different standards for moving a 3D model, and switching from one program to the other can be a bit of a pain. There seems to be no ambiguity with this sort of device, though.
Now, this device does seem to be too good to be true...that level of precision for only $70 seems insanely unrealistic. The developers are keeping quiet about what type of technology they're using, though, so there's no way to tell if they've come up with some amazing proprietary software/hardware combo or if this is just an elaborate scam. Guess we'll find out in a few months.