Well, my favourite movie adaptation of a book was the Studio Ghibli take on the book Howl's Moving Castle by Dianna Wynne Jones... I think there would be nice potential for others of her books...
Yes, but the movie and book had nothing to do with each other. Not that I'm disagreeing with you, I own both and have watched/read each more times that I can count (or would admit). I'm just saying that the two really had nothing to do with each other on the whole. I'm wondering how she feels about what they did to her story, and if that would influence her decision to let them make more of her stories into movies.
I like the way the book and film of that worked, I mean, they're just differnent flavours of the same theme, and the movie was created in a different culture, nearly twenty years after the book - I fully am appreciative of this extra, expanded context it adds to it.
I thought it added a very interesting flavour to it - the book of howl's moving castle was a little higgildy-piggildy so it would always have had to be streamlined along some line to make a nice, tight movie (IMO).
Both the book and movie increase my apprieciation of eachother though - in my opion that's the best way for it to be. I don't think I would like them both if the movie was just a play by play exactly of the book. Howl's moving castle was a good and very enjoyable look, but the film really took it to a different place.