Aqua Dock - An OS X style, animated launchbar/taskbar on your screen
Aqua Dock is a free application that will allow you to have an “OS X” style, nice animated launchbar / taskbar on your screen that will react to your mouse when you mouse over it.

Users can customize the look of each item on the dock and set various animation options for when the mouse is over an item on the dock. It is very easy to configure.