Windows 7 developers have kept that in mind and brought in quite a lot of good features accessible from keyboard. Let me put them down as a list.

From Desktop

  1. Windows Key + Tab = Aero [press Tab to cycle between Windows]
  2. Windows Key + E = Windows Explorer is launched.
  3. Windows Key + R =Run Command is launched.
  4. Windows Key + F = Search (which is there in previous Windows versions too)
  5. Windows Key + X= Mobility Center
  6. Windows Key + L= Lock Computer (It is there from the earlier versions as well)
  7. Windows Key + U= Ease of Access
  8. Windows Key + P = Projector
  9. Windows Key + T = Cycle Super Taskbar Items
  10. Windows Key + S = OneNote Screen Clipping Tool [requires OneNote]
  11. Windows Key + M= Minimize All Windows
  12. Windows Key + D = Show/Hide Desktop
  13. Windows Key + Up= Maximize Current Window
  14. Windows Key + Down = Restore Down / Minimize Current Windows
  15. Windows Key + Left = Tile Current Window to the Left
  16. Windows Key + Right = Tile Current Windows to the Right
    [Continue pressing the Left and Right keys to rotate the window as well]
  17. Windows Key + # = Quicklaunch
  18. Windows Key + == Magnifier

From Windows Explorer

19. Alt + Up= Go up one level
20.Alt + Left/ Right= Back/ Forward