Well hosting a co-op game locally isn't difficult, I'm not sure if you can host a dedicated one, but you can host one by yourself (over the internet) and then let everyone know that might be interested by contacting you via pm.You should be able to pickup the hosted game via the ingame co-op browser, and if you add the other users as friends via ingame, then just adjust your server browser's filter to "Friends" and it should also list the server. Just make sure you passw protect it, and give the passw to the parties interested in playing, I'm really keen for some co-op action, I just won't be able to host more than 2 players (myself included) on my 384k line, although I haven't tested it yet with more than 2 players.