I definitely think there should be one... for instance, today I had no clue where to post the Heroes Season 1 DVD release at.
I don't want to put it in the show thread, since a) I haven't seen the show and it's full of spoilers and b) people like me who are waiting for the DVD won't check the Heroes thread for the news, since it's people talking about the show.
I think a TV / DVD / Movies forum would be an awesome idea.