I finally broke down and started playing around with Twitter the other night. As chance would have it, I happened to see a reference to the Twitter Updater plugin for Wordpress and thought "hey, that would be an easy drupal module". That's a game I used to play (or at least do something about) much more regularly, however, the stars were aligned (or maybe it's the new glasses). So I threw together a Twitter module for Drupal.
So far, it functions a lot like the wordpress plugin. Each user can use their own twitter account and have their own "format" for the text that gets posted to twitter when they create a new post. When you create content, twitter gets notified.