Image via CrunchBase
TweetDeck, like a few of the other social media enablers (StumbleUpon noticeably) seems to have been going through a spate of updates and releases recently.
They had a big upgrade a few months back that included the Facebook integration, but I've actually found the most recent ones more useful in terms of additional functionality.
The most useful of the recent updates has been the creation of a TweetDeck account system that facilitates the syncing of TweetDeck groups wherever you use the application.
I'm a fan of TweetDeck's groups, they improve the functionality of Twitter as an application for me significantly. Something that I'd like all applications to do, facilitate the existing service offering and improve from that base.