Yeah, that doesn't surprise me. It was the biggest hassle for FlexWiki, when we were using that at Convoq, which is why it occurred to me. A surprising number of wikis really don't real with external media at all.

Anyway, I'll give it a look. When I was checking out wikitech last year, MoinMoin was certainly one of the more interesting ones. (Although it does have a mild strike against it that we aren't otherwise using Python, so it adds another server tech that needs to be maintained...)