OCModShop published a guide about putting MyComputer on Vista's Taskbar
Many of us like to have the quickest possible route to our commonly used folders. Even though nearly everything is accessible via the Start Menu, I like to have one-click access to commonly used items, such as Internet Explorer and My Computer.> Put MyComputer on Vista's Taskbar
The Vista taskbar comes with some neat pre-defined Toolbars (like Quick launch and Windows Media Player), but did you know you can create a toolbar from just about any object on your PC? You can add the Computer menu as a folder to have quick access to your drives, shortcuts and network connections. You also like to add my Desktop as a Toolbar, so I can always access stuff on my desktop even if they're buried under a bunch of open Windows.