Bumptop 3D Desktop interface

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I'd been imagining a more paper-like interface for my Tablet PC for a while now. Specifically, I think a layered note-taking app, in which you can stick notes on top of each other, would be quite fun.

But these guys working on Bumptop are taking the idea two steps beyond. At first glance, the interface may not seem useful, but skip to the 4:45 point in the video and tell me that's not a killer way to work with photos.
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