New Windows 7 hotkeys

Windows logo key +Home => Clear all but the active window
Windows logo key +Space => All windows become transparent so you can see through to the desktop
Windows logo key +Up arrow => Maximize the active window
Windows logo key +Down arrow: => Minimize the active window or restore the window if it’s maximized
Windows logo key +Left/Right arrows => Dock the active window to each side of the monitor
Windows logo key +Shift+Left/Right arrows => If you’ve got dual monitors, this will move the active window to the adjacent monitor
Windows logo key +T => Shift focus to and scroll through items on the taskbar
Windows logo key +P => Adjust presentation settings for your display
Windows logo key +(+/-) => Zoom in/out
Windows logo key +Click => a taskbar item Open a new instance of that particular application

for more shortcuts visit...
www.conetrix.com/Blog/post/List-of-Windows-7-Keyboard-Shortcuts.aspx