They are playing The Stand on Zone Horror on Friday nights. This Friday is the final instalment. I forgot just how crappy that mini-series was. I agree that is one where the book is better than the movie. They should re-do it as a full "one season" series. Unfortunately, that would go over here in terms of production, but it doesn't in the States. I would be really disappointed if they tried to do a second season going where the book didn't, and if it was successful, you know they'd be tempted.
I think The Shawshank Redemption, Carrie, and Stand by Me were equally good as films and books. I think those novellas are some of King's best writing, so the film makers had a lot to work with. I think Misery was better as a film. Most of King's stuff doesn't translate all that well into film [edit: not because it couldn't translate well if certain choices were made], and I think they slaughtered Hearts in Atlantis. It's probably not the worst movie based on a book by Stephen King, but the book got me back into reading him after giving up on him, so I was pretty disappointed.
Sorry about the treatise on King movie adaptations, but I spent my teen years reading and re-reading his stuff.
A couple to add to the novel better than film category:
Hitchhiker's Guide to the Galaxy
On the Beach (the old one anyway. I've not seen the remake)