Q: Does ikiwiki have a history view a la mediawiki? Large, destructive edits - removing outdated information, for instance - would potentially be more attractive if selectively reverting parts of them were easier.

A: the back-end is git, and it's publicly accessible. you can always check out the entire repository: http://git.hands.com/?p=rhombus.git and then use "git log" and "git diff".