Bump Top is a new (beta) 3D desktop that allows users to have a very unique and fun experience while using their computer.
It's kind of hard to explain what BT is w/out seeing it in action. I happen to be using a very earlier Mac version, but there is a more stable version out there for Windows. That being said it still was very user friendly and had a nice intuitive design.
When BT is in use it replaces the current user's desktop. This desktop is completely customizable. For example, a person can make their file icon's either bigger/smaller, stack them, and even pin them to side walls for important items. While some user's might find this confusing they have a nice grid view they can use which is similar to what the standard is now.
I highly recommend checking out their video for a unique experience!!