General Manager of macVolks, Inc.
Our Expert Agrees: If you want to grab just a portion of your screen, use the Shift+Command+4 key command. Once your mouse turns into a crosshair symbol, find the area that you'd like to take a screen shot of, hold the mouse down, and select the area you wish to capture. Once you release the mouse, it will capture the area you had selected and automatically save to your desktop as a PNG file.