Open up the finder go Applications -> Utilities -> Grab. Grab is a screenshot tool that can be used to take the whole screen, the whole screen after x seconds, individual windows (thus saving you cropping) and wahtever you select with a box. It outputs to .tiff which is easily converted to a more sensible format like .png. It's what I used to take all the Mac screenshots for the OcUK OS X Folding@Home installation guide.
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