I have been using Nucleus to run WebBizProfit.com for quite a while now and it is excellent for my purposes.

I have also evaluated Drupal and decided on it for the Vitality News site that will support the Vitality News health newsletter. Drupal is a very comprehensive CMS with lots of relevant features (like multiple RSS feeds and SEO urls) for marketers. This is my choice for a content site that will ultimately have thousands of pages.

There still remained the issue of creating online documentation as a knowledge base for membership sites. My current choice of software for the content of a membership site is Geeklog. Geeklog does have an integrated FAQ plugin (requires separate installation) but I am always on the lookout for better things.

BlogCMS is based on the Nucleus core code and with that package comes DokuWiki.

Now this application doesn't use MySQL database integration but after reading a comparison of a number of different Wiki, from a Randy Brown, a DokuWiki user, it is the obvious choice because of its ability to define user access.

So DokuWiki will be my Wiki of choice.