one of the blogs I read weekly:
Darth Mojo
Its one of the guys who was a fx/visuals guys on B5, Voyager, and now BSG. He has some great older articles (just click the SciFi link on the right) on B5 sets and nice mini essays on construction or fx and other behind-the-scenes stuff. Its really fun stuff to read.
Also read his blog entry on the Blade Runner charity night a few weeks ago, was very interesting stuff. 10 people won a charity auction afterwards for a backstage tour, and funnily enough 3 of the 10 posted their thoughts on his blog! small (nerd) world.