In an effort to post something that's not Booker Prize-related, I'll point you towards this list of the "Top 25 Librarian Bloggers." It's got four metrics, an explanation methodology... there's probably more, but I dozed off at that point.
I have to wonder if there aren't only about 30 librarian bloggers out there. How else do you explain number nine, Fililipino Librarian. Their slogan is "For those interested in knowing more about the Philippines, Filipiniana, Philippine libraries and Filipino librarians." A worthy cause, no doubt, but it's the world's ninth most popular librarian blog?--David E