Extend Mac OS X's Screenshots

To take a screenshot of something other than the entire screen, press Command-Shift-4. You'll get a crosshairs cursor with which you can drag out a selection rectangle. However, there are some other tricks you can use after pressing Command-Shift-4:

• Press the space bar to select the entire window that the cursor is over; the resulting screenshot will even get a nice drop shadow.
• Hold down the space bar while dragging out a selection to move your selection rectangle around on the screen. Let up on the space bar to resize the rectangle.
• Hold down Shift while dragging out a selection to constrain the selection in either horizontal or vertical orientation, depending on the direction of your drag.
• Hold down Option while dragging out a selection to expand the selection around a center point.

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