"The Mist" is my favorite Stephen King short story, and I'm interested to see the movie version (probably on DVD, since we're not taking Kelly to any films any time soon).
I always pictured it taking place in the grocery store I worked in, Knowlan's, in White Bear Lake, Minnesota (it's now a liquor store). And when they show scenes from the movie, it looks a lot like that store, which makes it even creepier.
I've heard that they changed the ending, which is kind of disappointing, since the story ended with such an unanswered question. But the AP review claims the new ending is equally good, so who knows?