Apple got the craze of Object docks going here a few of the great creations themselves the dock above is from OSX www.apple.com/macosx

RK launcher Free

Free | Windows
RK Launcher is a free application that will allow the user to have a visually pleasing bar at the side of the screen that is used to quickly launch shortcuts. With support for themes, PNG's and ICO's and with smooth amazing animations, RK Launcher is a versatile and great taskbar replacement.

RocketDock

Free by PunkLabs | Windows
RocketDock is a Mac OS X dock clone. It provides a nice clean interface to drop shortcuts on for easy access and organization.

ObjectDock

Free by Stardock | Windows
ObjectDock is a program that enables users to organize their shortcuts, programs and running tasks into an attractive and fun animated Dock.

Docky

Open Source | Linux

Docky is a frontend for GNOME Do (Do) that introduces an entirely new way to interact with Do. Docky helps Do become more directly involved with your desktop by providing a persistent mouse based Dock interface while remaining true to Dos keyboard only interaction. Being tied directly into Do allows Docky to be adaptive and dynamic. As your usage patterns change, so too does Docky. For everything Do can do, Docky can too.

Circle Dock

Open Source by Eric Wong | Windows
The idea behind Circle Dock is that the dock should appear where your mouse is instead of you having to move your mouse to the dock like with other programs.

Appetizer

Open Source by Laurent Cozic | Windows
Appetizer is a free application launcher, or dock, for Windows. It allows organizing your shortcuts and folders into a convenient dock. The app is open source, which means that its free and will remain so.

Nexus

Free by Alexandrie | Windows
Nexus is a multi-level dock system that nicely complements NextSTART and WorkShelf.

StandaloneStack 2

Free | Windows
StandaloneStack allows you to create a simple OSX like stack shortcut on your desktop or taskbar. Excellent as a quick start replacement on Windows 7.

Free Launch Bar

Free by Tordex | Windows
Free Launch Bar is a Free replacement for the standard Quick Launch bar. All functions presented in Quick Launch are also in Free Launch Bar.

XWindows Dock

Free by Vladimir Likhonos | Windows
XWindows Dock - or XWD for short - is the newest free Windows Vista and XP program of the class Application Launcher and Desktop Organizer.

Krento

Free by Serhiy Perevoznyk | Windows
Krento is a modern application manager and widget engine for Microsoft Windows. Krento can save your desktop space and assist you in boosting your productivity.

SliderDock

Free | Windows
SliderDock is an application launcher that will allow you to easily drag and drop icons to access them later on by double clicking on them.

Y'z Dock

Free by M.Yamaguchi | Windows
Y'z Dock is a program launcher like the dock in MacOS X. This application is currently in beta, so please send all reports to the author.

Dell Dock (my Favorite Dock)

Free from Dell | Windows (Dell computers only )
Dell Dock is a launcher similar to Rklauncher . Has some features That are better than RKlauncher and easier to use than rocketdock ! Dock Customization coming soon !

More info on Docks Clicky

I know some of these have been mentioned in other post here like This