The Dock, main navigation element in Apple's Mac OS X, is a powerful tool to quickly access your most important files if you tend to use the same pieces of software or the same folders over and over again. Rocketdock is such a dock application designed for Windows:
It works like the original OS X dock and can be placed on every border of the screen, additionally being highly customizable in terms of theme, effects and behaviour:
You can download Rocketdock here: http://www.rocketdock.com