I really like it! Looking forward to see if this desktop technique will be the one to use as a 3D feel becomes more and more part of our everyday computer experience.
BumpTop aims to enrich the desktop metaphor with expressive, lightweight techniques found in the real world.
Watching the video shows it is very flexible in how we would use it, to be able to resize icons, place them or pile them up as we see fit. Definitely something to keep an eye on as it develops.