i agree that the book is almost always better. one of my exceptions, though, is the shawshank redemption, by stephen king. the movie developed on the book (or short story, which it actually is). so much more happened in the movie, and it was more intense. the imagery the movie provided was incredible.
of course, i saw the movie before i read the story, which may have something to do with it. but i really liked the things the movie changed.