Good overview of Wiki engines
Written on the original Movable Type site and recovered from the Internet Archive.
ONLamp.com: Which Open Source Wiki Works For You?
Pretty good reveiw with recommendations. He trashes on Kwiki a little and recommends PHPWiki and TWiki instead. I am going to dig some more. PHPWiki is on my CPanel script auto install so I may in fact install that just because it is easy.