First, a little introduction to TweetDeck, right from their own site:
What is TweetDeck?
TweetDeck is an Adobe Air desktop application that is currently in public beta. It aims to evolve the existing functionality of Twitter by taking an abundance of information i.e twitter feeds, and breaking it down into more manageable bite sized pieces.
As I started to explore the Twitter world, I eventually looked for desktop clients which can save me going to Twitter website for looking for updates and etc. and thus I was recommended various desktop apps which interact with Twitter API and also adds more features to "Tweeting".
Recently I got a tweet from Mr. Tweet about the tutorial on TweetDeck software for Twitter and I find it easy to digest and pretty detailed. If you are by chance into Twitter, you should have a look at TweetDeck and you gonna love the guide "How to use TweetDeck" at Blogging Art and Practice blog.
I hope this will be useful for you. Happy Tweeting! :D