If, like me, you’re a Mac and PC user, then you’ll probably love RocketDock. It’s a freeware (!) Mac OSX dock for Windows (including Vista). Here’s are just a few of the features (from their website):

Minimize windows to the dock
Real-time window previews in Vista
Running application indicators
Simple drag-n-drop interface
Multi-monitor support
Supports alpha-blended PNG and ICO icons
Icons [...]