Guest Blogger: Tracy Marchini on 21 Things an Author Can Do With Twitter -- the Comments there are lots of "What? Twitter? What's that?"
Twitter demystified and debunked -- I disagree a bit about the "What are you doing?" because sometimes it's clearly needed. With people who Follow me, they need to know I'm not ignoring their tweets and letting them know why I'm not replying right now -- due to eating, or shower (yes), or a store run -- helps. On a bad day, I'll have three such tweets.
Twitscoop -- presents a hypnotic cloud of the most-used keywords on Twitter real-time.
Has anyone compiled a comprehensive list of all the sites that tie into the Twitter API?