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UberTwitter Beta 6 adds Twitter’s new retweet functionality (with the option to use the old style RTs too), Twitter lists and the ability to geotag your tweets. Previously, UberTwitter had its own geolocation features that attached a link to a map with your whereabouts to your tweets, but now this is combined with Twitter’s native geolocation capabilities.
There are more than a dozen significant new features in all, which you can read more about on the UberTwitter's site. The download is available here.