I think we will see this way of interacting with computers a lot in the years to come. It needs to be even better than this to become useful, but this is a good start. And imagine combining the ideas from BumpTop with ideas from Jaff Han and his team? A bright future!
What I like the best is the fact that you need to move more to use it: You use a pen and make circles, lines across the desktop. Not the static mouse we all have gotten so used to. In other words: More Africa in your computer.