Here are a few blogs I failed to mention in my previous post, Great Blogs for Writers.
Scriptwriting - Oscar-nominated Roger S. H. Schulman shares knowledge from his experiences writing for TV and film.
The Artful Writer - Craig Mazin, who wrote Scary Movie 3, talks about screenwriting, with a focus on the WGA.
Seriocity - TeeVee writer Kay Reindl (Haunted, Millennium, The Dead Zone) shares witticisms on genre writing for the boob tube. Block some time for these posts; they tend to be long.
The Rejecter - A literary agent's advice to aspiring writers who want to get published. The bad news is about 95% of you won't.