The server lists was working before, but for some reason they no longer work. It may be a Steam-side issue or the game's fault.
Hmm okay, I'm hoping this gets fixed b/c this was also a problem with cry of fear after the valve update. The only thing I noticed is that when one of my friend's host we can connect by ip, but if any other person hosts we can't. Probably a port forwarding thing in that case. Also I haven't tried out hamatchi for the stand alone, but I know it worked before for the mod. Still though I want to play multiplayer even when my friends aren't around so if they get this server listing thing fixed that would be great.