You might have already seen this very nice demo of a Delphi application interacting with your body position via the new Microsoft Kinect controller, hooked to a Windows PC. The video is below (and on YouTube, of course). The page describing the idea, the components, used, and links to the complete source code is at (and thanks to Nick for referring to it).

I guess it could be a proper company investment to buy one of those controllers... too bad I don't have an XBox, though, but that doesn't look like a company expense!