I came a cross something a while back that is really quite ingenious. To make this whiteboard, the main things you need are:
- A computer with bluetooth capabilities
- A Wii Remote Control
- A couple of small electronics (led, battery, wire, bic pen) available for a couple of bucks from Radio Shack.
- Recommended: (computer projector screen).
Johnny Lee provides the software to make it all work for free. See the Video for a demonstration: