Has anyone tried the GUI editor in the new MoinMoin release candidate?  It works great.  There still are a few bugs in it, but it saves perfect wiki code and doesn't scramble the revision history with HTML.

There are plugins for MediaWiki for a WYSIWYG editor, but it saves the code as HTML so doing diffs is hard read.  Someone tried to get WIKIWYG woking with Dokuwiki, and apparently has but I followed the instructions but still couldn't get it working.

I think a WYSIWYG gui editor is required for adoption by non-techies.  I was going to install Dokiwiki for people for a class, and after they took one look at it, they all said no thanks.  They didn't understand why brackets were needed for links, or how you know if you linked to the right page, how if you rename the page, etc.