Thanks, 'The Thing' sounds fantastic. If it captures even a tenth of the paranoia of the film, I'll be very happy indeed.
You won't be disappointed. It can get pretty tense especially in 4-6 player games. I don't recommend it for two players and even three players is kind of weak.
EDIT: Download The Things expansion to add a 5th and 6th player
EDIT2: Download these files instead: http://www.boardgamegeek.com/filepage/80876/the-thing-cards-...
They include the expansion.