would like to but no mac version (yet). it's interesting because i remember something about valve deciding to release all future games for os x and doze simultaneously but i guess they only meant their big-ticket games.
Alien Swarm is fun and all, but I always have the same ~10 people nagging me on steam HEY WANNA PLAY SOME AS? GOT A MOMENT? LETS PLAY SUM AS!
but yeah it's actually pretty fun, and was a pretty big surprise from Valve (in the sense that I hadn't even heard of it at all until it was released).