This guy, Johny Chung Lee, has made a nice hack using a Wiimote (the Nintendo Wii remote) to create an interactive drawing board and also touch screen applications.
Man, what a smart gentleman!
If you have heard about Microsoft Surface, then you’ll be quite familiar with this concept (or if you have already watched Tom’s Cruise film, Minority Report, when he interacts with the virtual touch screens)
Check the video out!
The interactive whiteboard video:
The virtual touch screen a la "Minority Report":
His site can be found here.