Windows 7 supports several useful new keyboard shortcuts:
Alt+P
Display/ hide the Explorer preview pane
Windows Logo+G
Display gadgets in front of other windows
Windows Logo++ (plus key)
Zoom in, where appropriate
Windows Logo+- (minus key)
Zoom out, where appropriate
Windows Logo+Up
Maximize the current window
Windows Logo+Down
Minimize the current window
Windows Logo+Left
Snap to the left hand side of the screen
Windows Logo+Right
Snap to the right hand side of the screen
Windows Logo+Home
Minimize/ restore everything except the current window
Also, read our Windows Shortcuts for the shortcuts available on other versions of Windows