What you see is what you get editor for mediawiki

Apparently, some others have been wanting the same things as me. My users complain all the time that mediawiki pages are hard to edit.
Admittedly they are not IT folks, but they are my target audience for my company intranet.

http://www.parand.com/say/index.php/2005/07/27/wysiwyg-editor-for-mediawiki/