Adobe has released Lightroom 4.3 with support for 20 cameras and 42 lens profiles (including the iPhone 5) and fixes for a variety of bugs. Amongst the highlights, the professional photo cataloging and editing application fixes a problem with uploading to Flickr if the photo’s filename contained an apostrophe, ensures that Catalogs from Photoshop Elements 11 are updated, properly imports AVCHD video, fixes an issue where TIFF images could experience a tonal shift, and fixes a flickering problem with videos created on the iPhone 4. Additionally, Lightroom 4.3 now supports Retina displays when using either the Library or Develop modules. ($149 new, free update, 419 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.