I probably wouldn't read a separate blog, but I don't mind them being combined.
I like Larry and Chris Miller's thoughts on this.
@Chris Miller - did you used to write the Unquiet Desperation blog?
I'm 95% in favor of a comic-book/fantasy/sf-style only theme, but I would provisionally allow Castle, because I like Nathan Fillion, and love Firefly.
My suggestion would be to designate a day of the week, or a week of the month (or whatever interval you like) to do the non-comic stuff. You could always use a specific keyword so that purists who have no interest in "Castle" or other "White Collar" can easily filter it.
My further suggestion would be not to deal with the legal accuracy of shows that have a lot of law in them unless there's a real surprise in there, or perhaps focus on the setup rather than the execution. For example, if you're doing an episode of "Psych", rather than discussing the vast array of evidentiary procedure violations that I can only assume appear in every episode, maybe go into the actual law dealing with psychics helping with police, what it means to be acting as an agent of the police, etc. Or what would actually have to happen for a mystery writer to be allowed at a crime scene.
In short, I like this blog because you deal with subject matter that is not primarily about the law, and discuss the different legal details they get right and wrong. If a police procedural show gets it right, that's not very interesting, and if they get it wrong, honestly that's not very interesting either.
This is one of my favorite blogs. I am a law student and a big nerd, and I love looking at comics, movies, and books with a lawyer's view. If you broadened the scope of this site to include additional media (Breaking Bad springs to mind) I would be nothing but thrilled. Keep up the good and entertaining work.