I have a confession to make: my contrarian nature causes me to boycott popular cultural phenomenon. When I was a kid, I refused to see both "Top Gun" and "Dirty Dancing" (still haven't seen 'em either). I still haven't sat through "Titantic." Even when "The Passion of the Christ" was the hot movie, I missed that as well (though I had more biblical, than contrarian reasons for missing that).
Which is all too say, I'll probably miss out on "The Da Vinci Code" movie, although I am tempted to read the novel. It appears that the entire evangelical world is trying to captilize on the movie, either for evangelism or apologetics. I won't miss not reading those books.
But one of the simplest and free explanations, as well as one of the best, about the errors of Dan Brown's novel is Phil Ryken's. I recommend it very highly as a thoughtful, Christian response.