Low-Cost Multi-point Interactive Whiteboards Using the Wiimote
Today I've discovered the web of Johnny Chung Lee a student from the Carnegie Mellon University at Pittsburg, USA.
He is working on some projects around the Wii console from Nintendo, but the most impressive one is the Low-Cost Multi-point Interactive Whiteboards Using the Wiimote (IMHO). Taken from his website, the explanation:
"Since the Wiimote can track sources of infrared (IR) light, you can track pens that have an IR led in the tip. By pointing a wiimote at a projection screen or LCD display, you can create very low-cost interactive whiteboards or tablet displays. Since the Wiimote can track upto 4 points, up to 4 pens can be used. It also works great with rear-projected displays."
There is even a video demostration, just take a look, it is quite impressive.