While Microsoft Surface's steep price tag of $10,000 makes it too expensive for the average consumer, TouchWall is the poor man's surface; with the system being constructed from "a few hundred dollars worth of readily available hardware."
Check out the above video for a demonstration of the TouchWall, which Gates calls, "the future whiteboard; the intelligent whiteboard" in action. Sadly, there are no current plans to market TouchWall as a product.
Here is another video demo:
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