One of the things I love about Mac OS X is that you can learn new features even after using it for years. Here's a tip I picked up via the Mac Life Podcast recently.
If you've got a messy desktop, you can get to a window's content and still keep the focus on the top window. Just hold down the Command key and move the window with your pointer- it will not overlap the top window. Great for referring something in the background window and typing in another.
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