With MacOS X, you can customize toolbars in the Finder, but why not the Dock as well? Dock Separators allow you to easily group your applications by dragging a copy of your favorite separator into the Dock. Removing a separator is just as easy, by dragging it away from the Dock.
LiquidMac uses a particle system to imitate liquid and responds to laptop orientation.
Wineskin Winery creates Mac OS X ports/wrappers for Windows programs/games, with an easy-to-use GUI, integrated Wine, X11 and an installer.
