I share everyone's fears and anxiety about the pending flop this could be. I think as long as we see the film first, then read the book, we're all ok It was that way for me and Dune. I went to see it at the theaters w/a friend who knew the books, so he explained a lot of it to me while the movie was rolling. I still didn't understand much, but as far as a sci-fi movie goes, I thought it was the greatest. A few years later, another friend and I rented it and it came with a booklet briefly explaining just who was who and what was what. We were still left a bit confused.
Later on, I got and read (and re-read) the entire series - loved them all. I still have a copy of the movie ... one of my favorites.
Thinking back though, I know if I had encountered them in the other order, I would have been (at the very least) left flat by the movie.
Dune is a great example of what DrSlop was talking about ... how it's easier and more a part of a book, to get you inside the head of the characters. Movies have a much harder time with that and I thought Dune did a better job than most.
Another really good example of this kind of thing is The Princess Bride (another of my favorites). After seeing it many times, I came across the book. It tells the tale of being actually an abridged version of the longer more boring book - almost the "movie version" of the original story. It's very interesting reading for any that like the movie.
Tools for your Wizardry(r) toolkit