The Code

First of all let me say that The DaVinci Code is a fun read. It is certainly no great work of literature, in fact it is rather poorly written and the style is at best referred to as "a good beach read". Furthermore, the characters in all of Brown's books are largely based on the same group of types; the smart iconoclast hero, the sexy and smart accomplice, the brilliant evil antagonist and his loyal followers (who tend to do the dirtywork, like Silas in The Code). So if you've read one, and like the story you can get it rehashed in Angels and Demons, Digital Fortress, etc.
I haven't seen the movie, but I'm sure it falls into that rather light and fluffy summer entertainment we have so long come to realize as our release from the heavier works of winter (such as Friends with Money). There are mixed reviews, but it is probably tolerable, if not taken too seriously.
Of course if you want facts about church history, you probably should avoid both book and movie. For a review of the factual problems you can get it here.