Valve has worked on a nice little game that they'll be releasing later today- "Alien Swarm".
http://store.steampowered.com/app/630/It's kinda like L4D- four people must cooperate to survive waves of extraterrestrials, and you can play with steam friends if you want. Unlike most Valve games, it seems this one will play with a bird's eye view instead of from first person.
When it releases, make sure to download it if you can. It's free, so maybe we could have a few cantina gamers give it a shot? I'll be online, so anyone can join up if they want.