RocketDock is what you need. RocketDock.com gives you a useful description:
RocketDock is a smoothly animated, alpha blended application launcher. It provides a nice clean interface to drop shortcuts on for easy access and organization. With each item completely customizable there is no end to what you can add and launch from the dock.The following video is an awesome video (not done by me), that will help you understand how to work with it.
It makes you interface really cool!!
by Toyang Qren
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