Here’s a quick list of handy Windows Key shortcuts for Windows 7:
1. Windows Key + D : Show/Hide Windows Desktop
2. Windows Key + E : Launch Windows Explorer
3. Windows Key + F : Launch Windows Search
4. Windows Key + L : Lock Windows Computer
5. Windows Key + M : Minimize All Windows
6. Windows Key + P : Quickly Switch Display
7. Windows Key + R : Run Dialog Box
8. Windows Key + S : OneNote Screen Clipping Tool (OneNote should be installed)
9. Windows Key + T : Cycle The Super Taskbar Items
10. Windows Key + U : Launches Ease of Access Center
11. Windows Key + X : Launches Windows Mobility Center
12. Windows Key + Space : Quick Desktop Peek
13. Windows Key + = : Launches the Magnifier Tool
14. Windows Key + Plus : Zoom in
15. Windows Key + Minus : Zooms out
16. Windows Key + Tab : Cycle Between Open Windows (uses Aero)
17. Windows Key + Up : Maximize Current Restored Window
18. Windows Key + Down : Minimize Current Restored Window / Restore Current Maximized Window
19. Windows Key + Left : Tile Current Window to the Left Side of The Screen
20. Windows Key + Right : Tile Current Window to the Right Side of The Screen
21. Windows Key + <n> (n is any number) : Restore Window for the Instance of the Application in the ‘n’th Slot on the Windows Taskbar