I quite like Kieran Healey's quip about the OxBloggers pinch-hitting for the Volokh Conspirators:

Even in the blogosphere, when the Prof is out of town, the grad students teach the class.

(I suspect that this is the harbinger of things to come. Given a) the time demands involved in blogging and b) the time demands involved in following multiple blogs, group-blogs-- Corner, Hit & Run, OxBlog, Conspiracy, etc-- seem to have a real advantage over individually-authored blogs: more content-per-effort for writers and readers alike. And now the group blogs are collaborating with each other to make sure that their posting frequency doesn't fall! Conspiracy, indeed... )