I stopped reading his books when he went into rehab, so from The Dark Half on I know nothing.I'm glossing over any I can't be arsed with or haven't seen.
Regards films......Carrie - Pisses me off, loved that book in school and the film is in my personal most overrated ever category....not shit but oh how I hate a good book spoiled.
Salems Lot - Long version, not as good as book, but surprisingly good for an adaptation that was shown on TV too, although they got the Vampire all wrong.
The Shining - I could argue back and forth about the benefits and problems of film vs source (never seen series, nor won't). I have problems with both that could fill this page, but I'll stick to this:
1.The book is about a man who is struggling with terrible guilt about past actions when he was a full on alcoholic. These parts I really get into. Then it chucks in some supernatural bollocks to spoil what should have been a story about one mans decent into insanity and cabin fever.
2.The film looks amazing. But Jack is mad from the get go and FAR too much of the guilt plot is missing eg virtually all of it. And it kept the supernatural bollocks.
I still like them both though

Christine - Dubious, possibly better than I remember it from about 18 years ago.
Pet Semetary - YO this is GOOD and doesn't totally fuck the book in the ass, its on the good list no doubt.
Misery- Pretty good, and worth a watch can't fault it too much
Then the 3 Frank Darabonts:
1.Shawshank - Fuck me. Yes its amazing. Double fuck me, anyone not liking this is not of this earth.
2.Green Mile - Massive surprise I liked it at the cinema in 2000, not seen since and never read.....I think it was because of the screen size and sound overwhelming me, because on reflection it is a much lesser work than Shawshank.
3.The Mist - YES FUCK YOU ALL ITS THE BEST ONE CUNTS! I loved the story about 18 years ago, then eventually it comes out to no fanfair and goes almost straight to dvd, meanwhile every horror site on the web trumpetted its delights. I rented. My life was changed. I think it is the best (horror) adaptation of a King book.
The ending is 10/10 alone, never mind what leads up to it.
Stand by me is 10/10 too.
Dolores Claibourne may be worth 9/10.