Howl's Moving Castle was made into an animated film by Hayao Miyazaki in 2004. Real fans of the book will tell you that the movie was good by itself, but strayed to far from the book, and the book was infinitely better. The only things the same between the book and the movie is the basic premise and four out of seven of the main characters' names. The last two-thirds of the movie were completely different from the book. Still, don't bash the movie, because Diana Wynne Jones said herself that it was good that the movie was very different from the book.
B: duh. erm. actually, howl's actual name is howell, which is such a pity, cause the name, howl, goes so totally well with amazingly good looks.*sigh*