Apple has released iMovie ’11 9.0.9, a small update for the video editing app that is nearing its third birthday (the iLife ’11 suite was originally released on 20 October 2010). This update squashes a bug that prevented iMovie from recognizing video cameras connected to your Mac and improves compatibility with projects that are imported from iMovie for iOS. Finally, it also includes unspecified stability improvements. ($14.99 new from the Mac App Store, free update through Software Update or the App Store app, 1.08 GB)
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.