Minimize all

Sometimes you have a document or icon on your desktop but you have a million open windows and minimizing them to get to your desktop is a pain.

Try holding Windows Logo key + M

To bring everything back, hold Shift + Windows Logo + M

Note: Windows Logo key is next to the Ctrl key on the left side most keyboards

Vista Users: There is a Show Desktop button in your quick launch menu (the menu next to your start menu) that will also minimize all windows.