Zipping files is a great way to save space and keep your files organised. Here’s how to work with zip files on a Mac - how to zip them and unpack (or 'unzip' them), how to extract a Jpeg from a zip on a Mac, and all your zip file info.Related StoriesReview: Photo Ninja 1.0 is the dark horse in the Raw converter sweepstakesObama says spying hit U.S. reputation, and he plans a fixRem