Streamreaders just keep getting better and better. A new version of TweetDeck is rolling out today with some major improvements, including support for Lists, Retweets, maps for geo-tagged messages, and LinkedIn streams. TweetDeck has already been downloaded more than 10 million times, and its active user base is in the low millions so this is a significant update. As soon as Twitter launched Lists (the ability to create and follow groups) as a regular feature, all the stream readers rushed to incorporate it . TweetDeck already let you create Groups in separate columns, and is now replacing that with Twitter Lists. Existing TweetDeck Groups will still work, but from now on when you create a new group it will be via the official List functionality and available for all other Twitter users to see if you choose to make it public. You can also export your old groups as a List.