Instead of the capacitive or resistive screen used in conventional touchscreens, Quanta uses two cheap cameras on the corners of the screen, allowing the multi-touches to be recognized - a system that's will be compatible with the upcoming Windows 7.
According to them, as screen sizes go up so will the cost savings associated with this system.
I'd really like to try this system, as I can quickly imagine a couple of finger placement that would hide another finger from the two cameras field of vision; and I would like to see how it handled that. But I'm sure they would have thought of that as well... wouldn't they?
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