The guys have talked about creating a social network-style site for a church, but for the most part, that's a completely internal affair--few people outside the church membership will join such a community, I'd expect.
What do you think about a site designed for the community, sponsored by the church, like http://www.myfortdodge.com/ (that one's not sponsored by a church--it's a commercial experiment--but is offered as an example of a community website)?
If the site were openly sponsored by the church, they could have a say as to what is and isn't allowed on the site, but I'm thinking that only the most extreme organic groups (Spouse swap, etc.) should be disallowed, and instead let the borderline groups serve as places for Christians to hit the streets and witness.
It's something I've been bouncing around in my head for a while, and I thought I'd see what thoughts others might have on the idea.