7stacks

7stacks is an easy to use, free app that lets Windows 7 (and Vista and XP) users have "stacks" of icons in their Taskbar (in 7) or QuickLaunch Toolbar (in Vista and XP). By using stacks, users can reduce icon clutter, and combine a group of related icons into a single icon. For instance, if you use application suites such as Microsoft Office, OpenOffice, or Adobe CS4, you can have all the suite's icons combined into one icon!
You can also use it to browse and access documents within a folder very quickly. Usually, when you want to edit a series of frequently used documents, you'd have to either launch the app, and go to File|Open, or open the (My) Computer icon and go into your (My) Documents folder and pick the file you want. With 7stacks, just create a stack to that document's folder, and open that document in a couple of clicks.
  
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Features:

• In 7 and Vista, 7stacks uses Aero, making the stacks look like part of Windows itself.
• Browse subfolders within a stack, just like in OS X Snow Leopard.
• 3 different styles of stacks: Normal, Grid, and Menu
• Normal displays a stack of icons vertically, with a text description next to it.
• Grid displays a "squarish" grid of icons only; useful when displaying a large number of items like document folders.
• Menu displays a cascading menu of items, with a very small icon and a name next to it. Hover over subfolders to browse inside those folders.
• In Windows 7, create a new stack by right-clicking on any stack and selecting "Create New Stack" from the JumpList entry.
• In Menu mode, 7stacks doesn't even need to be in a toolbar. You can use it right from your desktop, or any other folder.
• Pin up to 10 different stacks on the Windows 7 taskbar