Short cuts using windows key

Win key + R will open the Start menu's Run box 
Win key + F will open the Start menu's Find window 
Win key + E will quickly launch Explorer 
Win key + Pause/Break will open the System Properties window 
Win key + M will Minimize all windows 
Win key + Shift + M will undo Minimize all windows 
Win key + D will switch between minimizing all open programs and showing them all 
Win key + Tab will cycle through items on the taskbar 
Win key by itself will open the Start menu