Jim Roepcke's weblog have browser, will travel (est. 1999)

John Mayer graduates out of Twitter

TC: John Mayer Predicts Deadpool For Twitter

So basically, he's realized he wants to be a blogger, not a microblogger, because he has better control over his own site than he does over Twitter.

If Twitter is just a gateway drug to the real world of blogging, so be it. We just need real-time blog distribution systems (like PubSubHubBub and rssCloud) to provide Twitter-esque UX and it's not much of an issue.