One of the eye candy functions that Mac OS offers is a feature called Expose. Wikipedia describes this feature like so:

Exposé allows a user to quickly locate an open window, or to hide all windows and show the desktop without the need to click through many windows to find a specific target.

It is very similar to the tab view function offered by browsers where all your open tabs are displayed as a thumbnail and you simply click on what you want to open.

If you would like to add this functionality to Windows, you can do so with the DExposE2 utility. Simply put, this freeware eye candy program imitates the Mac functionality in Windows XP and Vista. There is a short video on their web site which shows how one user utilizes the utility on their Vista machine exactly as they would on a Mac.