Here is a list of keyboard shortcuts in Microsoft Windows 7, those uses the Windows key plus another one or two keys combination for shortcut.
Windows Key Only = Open or close the Start menu
Windows Key + Pause = Display the System Properties dialog box
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Windows Key + D = Show Desktop
Windows Key + M = Minimize all windows
Windows Key + Shift + M = Restore minimized windows
Windows Key + E = Open Computer
Windows Key + F = Find a file or folder
Windows Key + CTRL + F = Find network computers
Windows Key + L = Lock the computer or change session
Windows Key + R = Open the Run dialog box
Windows Key + T = Cycle through programs on the taskbar
Windows Key + Number key (0-9) = Run the program pinned to the Taskbar in the position indicated by the number
Windows Key + Shift + Number key (0-9) = Start a new instance of the program pinned to the Taskbar in the position indicated by the number
Windows Key + CTRL + Number key (0-9) = Move to the last active window of the program pinned to the Taskbar in the position indicated by the number
Windows Key + ALT + Number key (0-9) = Open Jump-list for the program pinned to the Taskbar in the position indicated by the number
Windows Key + TAB = Browse running in the taskbar with Aero Flip 3D
Windows Key + CTRL + TAB = Use the arrows to scroll through open programs in the taskbar with Aero Flip 3D
Windows Key + CTRL + B = Switch to the program that displays a message in the notification area
Windows Key + Space = Preview the Office
Windows Key + Up Arrow key = Enlarge window
Windows Key + Left Arrow key = Maximize the window on the left side of the screen
Windows Key + Right Arrow key = Maximize the window on the right side of the screen
Windows Key + Down Arrow key = Reduce the window
Windows Key + Home = Collapse All except the active window
Windows Key + Shift + Up Arrow = Stretch the window to the top of the screen
Windows Key + Shift + Left or Right = Move a window from one monitor to another
Windows Key + P = Choose a display mode
Windows Key + G = Browse Gadgets
Windows Key + U = Open Access Center
Windows Key + X = Open the Windows Mobility Center
