Twitter has released TweetDeck 3.0.2, which offers a notable interface redesign. A new icon sidebar on the left side replaces the previous top-mounted controls, offering a pair of buttons for creating a new tweet and for searching, and then a stack of buttons for each of your columns, plus three buttons at the bottom that expand the icons into text, open the list window, and access settings. You can finally rearrange columns by dragging their sidebar icons, and clicking a column icon focuses on that column, scrolling the main window as necessary. Some additional interface refinements are coming soon, but haven’t yet appeared in the Mac App Store. Once the next version arrives, you’ll be able to drag grab handles to rearrange columns as well, clicking a column icon will bring columns to the left edge if fewer than four columns are showing, and clicking a second time on a column icon will scroll that column to the top. (Free, 1.4 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.