It's strange: every time in the past that I've come out of a theater saying "that was way different from the book", I meant it in a bad way. Caspian has changed all that!
Don't get me wrong, the book is great. But it wouldn't have worked as a movie. And, somehow, they managed to make it different enough from the book to be a good movie, while still staying true to the basics of the book. Well done!