I can't believe no one has mentioned a couple of my favorites:
1. The Shining
2. The Stand
4. Pet Sematary
5. The Dead Zone
I could go on and on. I liked IT a ton, but I thought the ending was a letdown. I also loved The Tommyknockers.
Last year I read Black House. For those of you that liked The Talisman, you'll love it; it's the same character twenty years later.
I haven't enjoyed the stories he's written recently as some of his older works, but I always love the way he tells a story.