Bumptop is a new way to work with files that mirrors much more closing the experience of interacting with your desk in the physical universe. You can stack files, throw them around and even crumple them up in a 3D environment.
When I first watched this demo it felt like a novelty, but the more I thought about it the more potential I saw to organize content in a more dynamic and flexible way.
What I like most about this interface is that it is not trying to teach us a new method of interaction. Instead it is trying to replicate something we are already familiar with. The idea of using metaphors we already understand is a staple of interface design and is what makes things like tabs, desktops and folders so successful.