I've read about three-fourths of The Da Vinci Code. Unlike (apparently) most people who've read the book, I don't think it's all that well-written, and I've lost the motivation to finish it. I may not even go see the movie. But it saddens me that many people do not have even the little bit of Biblical/historical background that would help them see how much of The Da Vinci Code is simply untrue.
A good friend of mine has a blog that contains a lot of helpful information about The Da Vinci Code. If you want to know where Dan Brown is right and wrong, check this out: http://www.orangejack.com/davincicode/.