If you’re having a difficult time navigating all the Finder and application windows you have open on your Mac, you’ll enjoy the latest Quick Tip of the Week. Watch it, and you’ll discover how many options you have for keeping those proliferating windows in check with Exposé and a few handy keyboard shortcuts.
http://www.apple.com/business/theater/?sr=hotnews#tutorial=managingmultiplewindows
There are similar ways of doing it on Linux and Windows
