Twitter Tips for Journalists
Mindy McAdams, the Flash Goddess (her requested title from several years ago, may not be appropriate anymore), writes about what journalists need to get started on Twitter. Many, many excellent tips in there.
I fully admit to not using one of the fancier Twitter clients (I use Tweetie, which has become Twitter (which has, um, issues), because Tweetdeck was just completely overwhelming for me … but I have decided to go back to it and overcome the fear.)