POTENTIAL SPOILERS AHEAD! PROCEED WITH CAUTION!I also have to comment on the innovative creature design. Whoever dreamed up how these things looked is to be commended. The way they blended species was pretty cool and disturbing. The bird things looked kind of reptillian, but kind of avian, with those weird beaks and all, and the spider things, especially, were very creepy. In the scene where the one crawls across the windshield & you get a good but quick look at its face, and see that in adition to fangs/mandibles, it has a row of teeth behind that that looks almost human. It added very well to the alien-ness of what might otherwise have been a pretty ho-hum kind of monster (yeah, spiders are kind of creepy, but they weren't as alien as some of the other things creeping around in the mist).
As far as the ending goes, I got into a brief discussion w/ one of my friends about this film, and he didn't like the ending at all because he thought it was "mean spirited" and called it a rip off of "Night of the Living Dead". I guess the former is a vaild criticism,although I didn't perceive it as mean spirited so much as tragic. The latter, though, strikes me as unfounded. Are we going to cry NOTLD ripoff every time a film doesn't have a happy ending?