After my last post, Dane wrote in to share the CSI:MIAMI Producer's Blog. Some of the posts are more production-related, but there's some gossip from the writers room too. (Thanks, Dane!)
I also found the MIAMI MEDICAL Executive Producers Blog (it's an upcoming CBS show).
I did some searching for more and it seems like a lot of shows start blogs in their beginning promotions, but then only update once. I'm hoping we'll see more pop up.