"the Mist" written by Stephen King and Directed by the same person that did Shawshank Redemption and the Green Mile was one of the best movies I have seen overall in a long time. As far as suspense it kept me on the edge the whole way. It is one of the situations that just keeps getting dreadfully worse. Another thing I liked about it was the CGI wasnt over done but complimented over excellent use of robotics like "The Thing".
If you read the book it may not be as suspensful. I had not, but was expecting some type of rip off of The Fog. It was nothing like I thought, the story is simple yet very cool. IMO
A small 10 minute sample: