The only place there isn't an oddworld group is on gaia:
http://gaiaonline.com/
I checked the guilds section. I found quite a few rarely seen OWF members though, but they didn't have enough gold to make a guild. I'm just too lazy to do it myself.
And I know it's just to spread awareness of oddworld. (I often entertain the thought that oddworld might be just as popular as halo...)