Mac OS X - Print Screens

These are the shortcuts to be used to perform a screen print in Mac OS X:

CMD + Shift + 3 : Take a full screen shot
CMD + Shift + 4 : take a screen shot of an active window
CMD + Shift + 4 - followed by spacebar : select a specific area of the screen.

By default a PDF file is created on the desktop.
To change this and copy the image to the clipboard, hold down the control key with all of the combinations.