There is a private Steam forum for Demigod and God players: the Chaos Reborn Pantheon. Its original members were all Demigod and God backers of the game's Kickstarter. It never got much use because backers also had a private forum here.
Now that we have guilds, perhaps this Steam forum might find use for guild leaders to collaborate and communicate directly outside of the game's global chat. All in-game Demigods and Gods are eligible for membership.
Players of Demigod and God wizards can request an invitation here: http://steamcommunity.com/groups/crpan
EDIT: A short-link to the Steam group is http://bit.ly/crpan