I've been meaning to post on this article from the Chronicle of Higher Education by the pseudnymous(!) Ivan Tribble, "a humanities professor at a small liberal-arts college in the Midwest," about how blogging can hurt folks in the academic job market. Titled "Bloggers Need Not Apply," the essay suggests that blogging has more costs than benefits for academic job seekers.
Ann Althouse notes that the article conspicuously avoids "the one really serious danger that a responsible, high-quality blogger faces: revealing your politics." Daniel Drezner has some additional thoughts here that are also well worth the read. I don't have much to add to what they've already said, so go read their posts.