Jason Snell was lead editor at Macworld for more than a decade and has written about Apple and other tech companies for two decades. Now he writes at Six Colors. He's also the guy who runs The Incomparable podcast network, which is all about geeky pop culture, and hosts the Upgrade and Clockwise tech podcasts.
Mac OS X Zip Expanding Utility
Firefox (and possibly other applications) may ask you what you want to do with .zip archives that you download from the Internet. If you want to expand them with Mac OS X (rather than StuffIt Expander), you may be unsure of which application actually does the job. You're looking for Archive Utility (in Leopard and later) or BOMArchiveHelper (in Tiger). In either case, the application is stored in Hard Drive/System/Library/Core Services/. Don't move it from there, though, or you'll confuse matters.