Ergonis Software has released PopChar X 6.5 with a new custom insertion technique, which should make it faster to insert characters in applications that don’t reliably support direct event-based insertion of characters. The update also provides a workaround for a problem that caused the search field to be cleared while entering search terms on OS X 10.9 Mavericks, squashes a bug on non-English systems that prevented PopChar from remembering the previously selected layout, and improves the speed of clipboard-based insertions for many applications. (€29.99 new with a 25 percent discount for TidBITS members, free update, 3.7 MB, release notes)
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.