This book has been in my "to read" pile...
My wife read it, back when it first came out, and my mother just recently read it, and both raved about it.
Since the movie is now out on dvd, I wanted to go ahead and read it, before I watched the movie.
First, it truly is an amazing story of survival!
I enjoyed the book, and I am glad that I read it, though I am not sure that I loved it as much as my wife & mother. (some parts just seemed a bit repetitive is all)
As for the movie - in my opinion, the movie had the rare potential to be better than the book, but alas it is not.
After having read the book, the movie just seemed way too overly condensed/rushed.
While each is readable/watchable, if you are interested in this true story, I would definitely go the book route!