Does anyone know of any wikis with established and in-use user groups? You know, pages for organised groups of users to focus on improving a certain aspect of a wiki. Wikipedia calls them "WikiProjects".
I have my own ideas, but I'd like to see some good examples of how different wikis implement user groups to get some ideas. Particularly wikis which have had success with user groups.
I've checked a few of the top wikis I normally check "to see how they do it" on various issues, but those wikis don't appear to have usergroups at all.
edit: adding links.