This is pretty cool. Guy has figured out how to use the Wii remotes for Smartboard functionality, cheaper than buying one I am sure.
http://www.gearlog.com/2007/12/incredible_wiimote_hack_create.php (http://www.gearlog.com/2007/12/incredible_wiimote_hack_create.php)
That's kinda neat, given how tactile the Wiimote is. I've used some theoretically ergonomic 3D whiteboard pointing devices and given the price of most of them I was less than impressed.
Holy cow... So $45 for the Wiimote, $10 for the homemade IR pen, maybe? And the software is downloadable for free? That's an extremely cheap smart whiteboard! Also, it's portable enough to take with you on business trips and presentations...
Don't forget a bluetooth dongle if you don't have it built in and o yes a projector.. but ya, this is hella cheap.