Ok, I thought I had successfully avoided the urge to buy a Wii. But this looks like that might change my mind. (Of course finding one to buy is another story.) Johnny Lee has come up with a hack that allows you to use a Wiimote to bascially turn any surface into a whiteboard. The video explains it all. If you watch the video all the way through, there is some interesting multi-touch action happening on a Toshiba M200. Also check out the video on tracking your fingers with a Wiimote. Fascinating.
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