objectDock

ObjectDock is a dock similar to that in the Aqua GUI. It is distributed by Stardock for Windows 2000, 2003, XP, Vista and 7, and comes in Free and Plus versions.
fetures

ObjectDock allows the user to place shortcuts to any program in a "dock." This provides Windows users functionality similar to that of Mac OS X. The program comes in two versions, free, and a paid version offering more features. Both are available at their official website.

ObjectDock can be used as a program launcher, or as a complete taskbar replacement. Its functionality can be enhanced with plugins to provide features such as weather forecasts or news.