Twitter upgraded its suite of apps recently and gave Tweetdeck for the Mac a huge overhaul. Users loved the twitter client for its column-based interface and hated it for its reliance on Adobe Air. The latest version of Tweetdeck keeps the columns, but drops Adobe Air. It replaces it with a lighter, simplified interface; but that's not necessarily a good thing, especially for power users.
The new Tweetdeck is a scaled-down version of the Air Version. It has less room for columns and fewer options for each column. On my 13-inch MBP, I can only show three columns in the new Tweetdeck instead of four. I also can't filter tweets in a column any more.
Notifications are hit and miss for me as well. You can choose pop-up an
