Is it possible to store, view, and diff previous versions of each page? When I hear "wiki", I expect that ability (though I might conceivably be persuaded it's not necessary here).
Yes. If you're signed in as a user with write access, you will see buttons "Create Page", "Edit Page", and "More actions", and under more actions is "Revision History".
If you email me at andrew.wilcox@gmail.com, I'll add you as a user with write access :-)
Ah, I found a setting which enables viewing the revision history even for people who aren't logged in. In the page footer there's now a "Revision History" link.
