Most people love the eye candy in Vista. One of the best in this category is the Flip 3D function. It is an alternative to Alt+Tab that we use in XP.
The above image should give an idea of this feature.
While WinFlip is running, you can flip windows on the desktop using Win+Tab key.
If you love eye candy or want to show off with friends, this is definitely a must have ;)
Download latest version here