Credit:
We could list all the new features in Tweetdeck 0.33, but the company was nice enough to make this little video that shows everything off:
Some of the highlights:
Tweetdeck Can Manage Your Twitter API Usage -- This means that the program can delegate how to use your available API calls so that the most important info gets to you as easily as possible. Plus, Tweetdeck now uses OAuth and can request up to 350 API calls an hour, and that is expected to increase soon.
Better Column Management -- You can now view Flickr, YouTube and Posterous media within Tweetdeck.