To get my weekly Barth fix, I have subscribed to the new blogs by my theologian colleagues David Guretzki (Theommentary) and Dustin Resch ("...A Resch Like Me").
I've mentioned Old Testament prof Eric Ortlund's blog, Scatterings, before. The only other current faculty blogger I'm aware of is Danny Gamache, our business professor. Danny has been posting to his eponymous blog since the end of 2006. Are there others?