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Wild - right out of Minority Report. And available for purchase TODAY! Check out http://www.perceptivepixel.com/ for more info.

One interesting point up for discussion is there are no standards established yet when it comes to multi touch interfaces - therefore moving your hand on the iphone could have a different effect than moving your hand around on a perceptive pixel display. This introduces an interesting design problem, akin to having different key layouts on the first keyboards. Dan Saffer first wrote about this concept on his blogpost A Call to arms for interaction designers.