Print screen for Mac laptops: How?

[pll]

The preview allows you to crop... I usually go that route (over saving only a selection with shift-command-4), because in preview you can adjust the margins of the crop box at your leisure. Being 'mouse-impaired', that's a useful feature to me.

[laura*]

A little caveat: The screen capture ability is disabled when certain protected content is on screen. Notably, if you are watching an uncracked DVD movie, you won't be able to capture images from the movie.