It appears some Catholic groups are lodging an “official” complaint to the makers of The Da Vinci Code movie. And even more interesting, it may be the case that they are listening.
If you have been aware of this issue at all, you know that there are many competent rebuttals of Dan Brown’s historical fallacies. His history is an issue, really, only because he asserts at the beginning of the book that all the history he cites is true. It is amazing the power that one little phrase in an introduction can have. People are willing to question centuries of settled and known history about the Church and Christ because a fictional author with a vendetta says otherwise.
Anyway, if you are looking for more resources on the history referenced in The Da Vinci Code, this mp3 of a lecture done by Dr. Craig Blomberg is as useful as it gets.