I'd like to give a limited number of people that I don't want to be mods/admin exclusive control over a particular category/subforum without fear of interference by other members (or fear of the interfering with other members/groups). I'd like be able to create a group, and then add people to it, and then use the permissions settings to give them special rights to create pages, edit them, delete them in that/those categories, create threads, edit posts and delete them in that/those forums.
Before someone suggests separate sites, I expect these groups will already have separate private sites, and that they'll all want a central location to meet and organize, and have a public face. I'm looking to build a community of clans for Wii, and I think that combination of separate private sites, and one central communal site with custom group permissions that gives each clan a small corner for a public face that they alone can control would be very powerful.
Additional applications might be for communities that want to offer particular members or particular groups of members individual blogs that they can control, without forcing them to get their own sites or giving them too much control over the overall community site or other's blogs.
I realize wikis are about collaboration, and my suggestions might run a little counter to that, but I think there's a lot that competitive collaboration could offer to certain types of communities. For groups of clans, for instance, the combination of integrated forums, wikis, and blogs and separate private sites with the same registration system could be very powerful.
