Rogue Amoeba has released Airfoil 4.5.5, a minor update to its popular remote audio transmission app. The main focus of the new version is the correction of several issues related to Mac OS X 10.7 Lion, one of which is a severe crash. In addition, Airfoil now sports improved compatibility with Google Talk, Muse Controllers, and Radium (although the latter requires an as-yet-unreleased version of the Internet radio player app). ($25 new, free update, 11.3 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.
Check out the Take Control ebooks that expand on the topic in this article:
Set up short abbreviations which expand to larger bits of text,
such as "Tx" for "TextExpander". With the new custom keyboard,
you can expand abbreviations in any app, including Safari and