I read all of the Dan Brown books before the Da Vinci Code movie was ever made and even took a class on "The Da Vinci Code and other Forgeries" in college.
I said at the time that Angels & Demons was a better book and would make a FAR better movie. While the book comparison is debatable, the movie comparison is not. Angels & Demons was entertaining, kept you on the edge of your seat, and moved at a much faster pace than the Da Vinci Code movie (though Curtis Johnson on a fast break moved faster than Da Vinci Code). Did others see it? What'd you think?
Dan Brown has a new book coming out in the fall that I'm psyched about...his other 2 books are pretty good but not quite Da Vinci or A&D, IMO.