I love Stephen King, and have read almost all his books!
I like when he writes about authors- like in "The Dark Half" and "misery"- always wonder if he's imagined these things happening to him. His mind must be a seriously strange place.
A couple of my favourites haven't been mentioned- Needful Things and Desperation. Actually, desperation wasn't the best story, but that cop at the start really set the hairs on the back of my neck going!
The Stand was awesome, but the mental images of people dead in their cars in the tunnels always comes back to me whenever there is a new swine-flu/ bird-flu scare, and I live in terror of "The Plague"- it all just seems too possible