From Desktop
 - Windows Key + Tab = Aero [press Tab to cycle between Windows]
 - Windows Key + E = Windows Explorer is launched.
 - Windows Key + R = Run Command is launched.
 - Windows Key + F = Search (which is there in previous Windows versions too)
 - Windows Key + X = Mobility Center
 - Windows Key + L = Lock Computer (It is there from the earlier versions as well)
 - Windows Key + U = Ease of Access
 - Windows Key + P = Projector
 - Windows Key + T = Cycle Super Taskbar Items
 - Windows Key + S = OneNote Screen Clipping Tool [requires OneNote]
 - Windows Key + M = Minimize All Windows
 - Windows Key + D = Show/Hide Desktop
 - Windows Key + Up = Maximize Current Window
 - Windows Key + Down = Restore Down / Minimize Current Windows
 - Windows Key + Left = Tile Current Window to the Left
 - Windows Key + Right = Tile Current Windows to the Right [Continue pressing the Left and Right keys to rotate the window as well]
 - Windows Key + # = Quicklaunch
 - Windows Key + = = Magnifier
From Windows Explorer
 - Alt + Up = Go up one level
 - Alt + Left/ Right = Back/ Forward