Bunny and I saw “Angels and Demons [1]” tonight, and I must say, it was way more enjoyable than the book [2], mainly because the movie excised some of the sillier aspects of the book, like the harrowing helicopter ride (and if you've read the book, you know of which I speak)and the death of the evil henchmen is handled better.
Oh, and no X-33 [3] airplane (thankfully).
The backstory of the recently deceased Pope was removed, which was one aspect of the book I found interesting, but I can see why it was cut for the movie—simply no time to delve into it.
Overall, I enjoyed the movie way more then the book.
Then again, the book felt like a rought draft of a movie anyway.
[1] http://www.imdb.com/title/tt0808151/