More and more the question comes up in discussions I'm in on jobs: should one have a blog as a way to promote yourself personally?
I think the recent attention paid to twitter has brought blogging back into the spotlight by bringing more attention to online communication. In addition, the ability to put RSS feeds into everything makes blog-data more ubiquitous. So, much like Twitter, people are back to talking about blogs.
And so we're back to the question – do you need a blog for your career. My answer, is "maybe, but it's not the right question."