I sometimes find myself having Safari open, and the only browser window is minimized. Usually you use the mouse to bring back the minimized window, or hit Control-F3 (Move focus to the Dock) and the arrow keys. But here's a much quicker way:
Just make sure Safari is the active app, then hit Command-L -- this is the shortcut for File: Open Location, and it will restore the minimized window from the Dock, instead of opening a new window.
[robg adds: This also works for Camino, but not OmniWeb or Firefox. OmniWeb opens a new window, and Firefox does nothing.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20060521101921188