Thanks for the feedback, everyone!
I am aware of HTML Area, but wasn't sure how I'd integrate that with a standard wiki package.
Also, Lisa, regarding MediaWiki... I looked on their site, but couldn't see anything about wysiwyg. Furthermore, when I played in the Wikipedia sandbox, I didn't see any wysiwyg controls. Also, when I edited a page in eewiki, I saw formatting control buttons, but no wyswig views.
What am I missing here? Frankly, I'm looking for something like EditMe or SeedWiki but hosted on my server here.