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 http://itsecuritylab.eu/index.php/2010/12/27/kinect-and-delphi/ (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!