I think I would like mail notifications. Though it kinda comes out of this general fear of vandalisation.
So if some 'evil doer' turned my wiki into a porn site, I would like to rectify it ASAP. So I would like:
- Mail notifications of edits not made by me (or established contributors)
- If there is something fishy, the steps I would need to revert the changes
Mail notifications are probably not required. For example I get lots of comments on my blog, but I don't get mailed about them. They go through the (proprietary) Akismet filter.
Perhaps a powerful little UNDO feature on RecentChanges is all that is needed.