Rafe Needleman at Webware has written a great introduction to Twitter titled the Newbie’s Guide to Twitter. If you’re curious about Twitter, Needleman provides a pretty good overview. He compare’s it too Google’s Dodgeball service, but easier to use.
Personally, I think Jaiku is the better Twitterer. It reads everything, including my new del.icio.us tags, Flickr photos, tunes played and more. As someone over there tweets: “Twitter is so March 2007…” Mashable even pokes fun at the buzz with the Evolution of Blogging (the cat version).