Tools
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Taking Screenshots in Mac OS X
From Mac Guides There are several keyboard combinations that can be used to take screenshots in Mac OS X. The SystemUIServer process handles these commands. Shortcuts Command-Shift-3: Take a screenshot of the screen, and save it as a file on the desktop Command-Shift-4, then select an area: Take a screenshot of an area and save it as a file on the desktop Command-Shift-4, then space, then click a window: Take a screenshot of a window and save it as a file on the desktop Command-Control-Shift-3: Take a screenshot of the screen, and save it to the clipboard Command-Control-Shift-4, then select an area: Take a screenshot of an area and save it to the clipboard Command-Control-Shift-4, then space, then click a window: Take a screenshot of a window and save it to the clipboard In Leopard and later, the following keys can be held down while selecting an area (via Command-Shift-4 or Command-Control-Shift-4):In one way, Windows users have it easy: to copy a picture of their computer screen to the clipboard, all they have to do is press the Print Screen key. Mac users have to press the arcane combination Command+Shift+Control+3. Three years ago, O'Reilly's MacDevCenter discussed that technique and more in Screenshot Hacks for Mac OS X .
digitalmedia/2006/01/01/mac-os-x-screenshot-secrets.html