Low cost Whiteboard

"I found this great digital whiteboard somebody designed, for illustration purposes which uses the mini IR Camera in every WiiMote and some software, plus you need to build a small IR pointer from an old pen. I built mine simply by wiring up an IR LED with resistor (about 80ohms), a small switch, and a 2xAA battery pack all stuffed into an old pen.All credit goes to Johnny Chung Lee of Carnegie Mellon HCI institute for this system. I just built an IR pointer and used his software and set up the hardware.See http://johnnylee.net for the full lowdown." via: YouTube