I'm excited that this awesome book is being made into a movie. I'm not sure how excited I am about Ridley Scott or Matt Damon, simply because I don't know that the book really fits what I envision them creating. However, I'm not really opposed to it either, and I think Matt Damon, though an easy target, has done some pretty good movies overall. I did picture the guy in the book a little differently, mostly because of his self-deprecating humor, but I think Damon will probably do just fine.
On the plus side, having those two attached to it means it would get the full budget treatment it deserves, so that's a good thing no matter what. I'm excited to see what becomes of this.