Been some great shouts, not read shawshank but the film is great, misery, stand by me, green mile are all great too (books and film) thinner is also good, film not as good as the book tho. The stand is great book, wasn't keen on the film with Rob Lowe, running man is good book but the film is shit, even worse now it's dated. needful things was very disappointing considering how good the book is. Pet cemetery, salems lot, Carrie,langoliers,the one with the possessed car, cujo, you forget just how much work the guys done. "It" is a good film but not a patch in the book.
For me, I'd have to say misery, because it's the only one as good as the book.