One thing that "amazes" me on a MAC desktop is its object dock wherein the icons actually zoom in a parabolic way when you hover your mouse pointer on it. I thought it was exclusive for MAC then so I didn't bothered looking for a Linux equivalent.
Now that I am on KDE, I found out that there is ksmoothdock. Ksmoothdock is a cool desktop panel (like KDE's kicker) for KDE 3.2 and above with smooth zooming (2 modes: normal & parabolic). Its aim is to provide a cool alternative/complement to kicker. As it is intended for KDE/Linux, its behavior will be like that of kicker.
Here's are screenshots:
Neat! I am using the Aqua Fusion Icon Theme the Baghira window decorator. Perfect for Linux (KDE) enthusiast who would want a MAC twist to their desktop look. :)