The one thing I don't like Tweetdeck, is whether I'm using the mac app, or Chrome ext., it isn't that collapsable width wise. I use a 15" pro, and like to have both a twitter app, and browser up at the same time. I now use Janetter (mac app), as it is the smallest width wise, but still allows multiple columns, and other features if I want.

Yeah, we’re with you on that. The old TweetDeck let the user collapse into one column, but not new Tweetdeck, sadly.