I've read Angels & Demons, DaVinci Code and Digital Fotress in that order. I was lucky to be introduced to DB's work by a friend who had read them, so I read Angels & Demons first. This was before DVC was made into a movie. I already have Deception Point but just haven't gotten round to reading it yet.

One thing I especially liked about Angels & Demons is how certain words were designed to be identical when viewed upside down. Like the stylized title itself. Very cool. I wonder if they will use that in the movie?