If you minimize a window of an app to the dock, and then have Exposé show the desktop (sliding all windows off to the sides), when you bring the minimized window out of the dock all of the other windows stay to the sides.
I like this better than the "Hide Others" command, as this then messes up the Exposé/All Windows command.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20031212132912487