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)
Open a Finder Window with the App Switcher
If you don't have any Finder windows open and want to switch to the Finder and open a window in one fell swoop, bring up the app switcher with Command-Tab and tab over to the Finder icon. While still holding down Command, press the Option key, and then release the Command key. You're switched to the Finder, with a new default window open for you.