Two for one today, since I missed last week.
015: Sex In A Submarine.
Writer William Martel has many produced screenplays under his belt, mostly of the B-movie variety (my kind of guy!). His frequently-updated blog, "Sex In A Submarine," is filled with great anecdotes about both the art and (sometimes seedy) business of writing movies that are more likely to show up on Cinemax than at your local multiplex.
016: John August.
At the other end of the screenwriting blogosphere, you'll find John August, author of "Hollywood" screenplays like Charlie and the Chocolate Factory, Big Fish, and Charlie's Angels. August is mostly writing about the Writer's Guild strike these days, but you can dig through his archives for lots of good advice for up-and-coming scribes.