Aside from the normal, more well known shortcut keys like Windows Key + D to show the desktop or Windows Key + L to lock the desktop, I stumbled upon another set of shortcut keys while messing with an AutoHotKey script.
Anyways, I discovered that hitting the Windows Key + a number 0-9 starts or maximizes the window in the corresponding position in your taskbar.
For example, take a look at the picture below. If you hit Windows Key + 1, it will open Internet Explorer. If you do Windows Key + 2, the Libraries (Windows Explorer) will open, Windows Key + 3 will make Windows Media Player open, and so on.
If the applications are already opened, then the shortcut keys will minimize/maximize the windows.
If you have more than one window of a particular application, say 3 Internet Explorer windows, then hitting the shortcut key for Internet Explorer (Windows Key + 1 in this case) will scroll through the open windows in an alt-tab manner.
For a complete listing of Windows Shortcut keys, here's a good page with them all laid out:
http://www.computerhope.com/shortcut/windows.htm
