Stand By Me
The Shawshank Redemption
Silver Bullet
The Dead Zone
Creepshow (King wrote the screenplay)
Christine
IT
Apt Pupil (I think I liked it, saw it only once long ago)
The Shining (Good movie, but it strayed from the book)
So bad its good:
Graveyard Shift
The Lawnmower Man (Although it has nothing to do with the story)
The Running Man
Shockingly I've never seen Misery.