http://www.youtube.com/watch?v=-dnL00TdmLY
Thoughts?
I'm not sure whether the interface they used was intentionally modeled after an existing wiki package, or was just a generalized example. The idea of prominent "edit" and "link" (for creating a new page) buttons strikes me as more user-friendly, particularly for someone who's not accustomed to the idea of a wiki.
Most of us probably know MediaWiki's syntax like the backs of our hands, but I can see how it could be intimidating for a new user—particularly on already well-developed articles, which tend to have wikitext cluttered with tables and reference templates and all that. The toolbar that Wikimedia wikis have doesn't really seem obvious, at least to me, and it requires JavaScript.