Here's one of the more unique uses of Microsoft's Kinect. A project called Fabricate Yourself turns the Kinect into a 3D printer of sorts. Well, a 3D modeler for a 3D printer. You'd best follow along with the video.
The gist is that the Kinect takes 3D photos of whatever (in the video, it's of enthusiastic young people), then the images are converted to the relevant file format, then passed off to a Dimension 3D printer.
Voilà, little 3D printouts for you to enjoy.