I agree with everybody in this thread. I think a game based solely around co-op would be amazing, and I think that if anybody can pull it off at all, it's Valve.
I think zombies rule. I read that whole list of zombie games Ben posted, and some games I've enjoyed have had a few zombies in them, like Doom, Half-Life, and Metal Slug, but the only "Zombie game" I've loved dearly was Zombies Ate My Neighbors. The rest of the list was crap or maybe okay, but I haven't played it and never will.
I think the genre's getting pushed a lot these days due to the recent resurgence of zombie movies from 28 Days Later to Planet Terror, but all the games suck, so I can understand why the setting alone can leave a bad taste in somebody's mouth.
Now personally, I really hope that some day somebody can do a zombie game justice, and do it right. Maybe this is that game. Maybe it isn't. I hope it is. I also hope I have a fast internet connection by the time it comes out, because I can't even play my Team Fortress 2.












