I love UseMod and so far have been using it for various small projects that I'm part of.
I've started a UseModDescendant called CommunityProgrammedWiki which has features allowing the user community to modify the wiki script. Imagine collaboratively writing software the same way we currently write wiki content. In CommunityProgrammedWiki, patches are accepted by consensus instead of by the lead developer.
(for my convenience: my UserID here is 3631. Here is my [personal login link])