Sorry this issue is a day late - for those of you not in the U.S., Monday was Labor Day, a national holiday celebrated in true oxymoronic style by not working. I wonder if there are any holidays that people celebrate by working especially hard? Probably not.
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.