If you have yet to try TweetDeck, put it on your ToDo list! There are many reasons why I expect this Adobe Air tool to become the Twitter client of popular choice in 2009.
Click the image for a quick overview of TweetDeck:
As users expand the use of Twitter to engage in wide-ranging and ongoing discussions, TweetDeck will remain agile enough to track group activity; to search keywords; or to gather 'hashtags'.
As just one example, Alec Couros' recently recreated a PLN vs. PLE debate, which may have been one of the first massively open online discussions. The use of a tool like TweetDeck will allow users to engage in multiple self-organizing discussions.
A brief tutorial, outlining some of the possibilities, appears below: