Had to put the title just because it might pop up on about a gazillion search engines!
I have completely ignored the arguments about the DaVinci Code because, in my humble opinion and all that, its not worth it. It would be like arguing about a James Bond book, or Robert Ludlum (choose your thriller writer!) - I don't try to get my theology from novels, even Christian ones (I've read some horrendous Christian novels).
On the other hand, there is a very good response from the rightly revered Rt Revd NT Wright which can be found here. Worth reading.
Da Vinci Code