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The new version has been rewritten from scratch and includes a redesign (the folks at TweetDeck claim the app will shine with the iPhone's retina display) and one major new feature: fully flexible columns.
For those who aren't familiar with TweetDeck, the app enables users to create columns containing various information streams, for example Twitter replies or direct messages. In the upcoming version, users will be able to combine several streams such as Facebook feeds, Twitter direct messages, mentions and lists, which is the kind of flexibility advanced users will surely love and appreciate.