Review on WackoWiki by Jimmy Scaturro

It's very fast to install, it has great features like multiple languages support (both English & Spanish), templates for both pages as well as posts/comments are available in different formats. The only drawback I found was the lack of custom fields for page creation but this can be easily solved by using plugins or other extensions. If you want something simple yet powerful then go ahead! We use wacky wiki because we need our members to post articles related to their work place which helps us keep track about what they do daily at workplace.