This is a great interview of James Bradley, about 'Vampires in Fiction' from the ABC Radio National Book show with Ramona Koval.
It is about fiction not film, but most of the fiction that they talk about have been made into TV shows of films such as, Twilight, Sookie Stackhouse and Buffy. (Although, Buffy was never a book series)
Like the Harry Potter phenomenon, people what to understand why fantasy fiction and film resonates so strongly with people, particularly young adults, at this point in history.
I don't think that they really nailed it with their theory of why vampire fiction is so attractive to young girls though. I won't say anything though, you listen and see what you'all think.