My wife and I own a copy of every piece of fiction that he's ever written, including comics, and we've read about 75% of it so far.  My faves:
1.  Different Seasons---I've actually re-read this one a couple of times
2.  Eyes of the Dragon---very solid sword n' sorcery stuff
3.  Salem's Lot---the prototypical "eclectic group of characters team up to fight the bad guy" story
4.  Storm of the Century---I watched the mini on TV before reading the screenplay---very interesting premise
5.  Cell---I would love to see this one made into a gazillion dollar blockbuster---the visuals are so intense
6.  Lisey's Story---gut-wrenching and disturbing---man, do you root for that heroine!
7.  Dark Tower---haven't finished the saga yet, but I'm really getting into it
The only things of ol' Uncle Stevie's that I did not enjoy were a few of his early short stories---too many Lady or the Tiger endings, and Dreamcatcher, which was a fantastic idea for a 600-page book, but it was, unfortunately, a 900-page book.
King-based movies and TV minis have been all over the map, but I would say that my faves (be they faithful to their sources or not) were Shawshank Redemption, Stand By Me, and Kubrick's The Shining.  Carrie, Cujo, and Christine are enjoyable, in a B-moive kind of way.
He has said in his articles and in interviews that he's a liberal Democrat, but I don't recall any of his books that give that fact away.  Perhaps I am obtuse.
BTW, I used to love King's articles in Entertainment Weekly.  He still do those?