You are right! Now that I go through the support section it is like help!
I agree with Ryan on the awkard of most Wiki but I also agree with Jeff on the Wiki part.
I have been through many Wiki and found one is very easy to use very easy to integrate to anything and very flexible and very customizable, and more. Here is a great little DokuWiki that I use and like a lot. You can make it public or member only.
The purpose of the Wiki is to expand the contributing factor to the wider audience and encourage colobration between people. It can be use for anything you want it to be whether it is documentation, FAQ, brainstorming, etc.
Here is a Wiki site that I created to help document the Mojavi project:
http://mojavi.ongetc.com/doku.php
And here is the link to code that let you export Wiki document to a pdf file:
http://wiki.splitbrain.org/wiki:tips:pdfexport
And here is an article that I put together to show how to integrate DokiWiki into Mambo.
http://ongetc.com/index.php?option=com_content&task=view&id=158&Itemid=25
If you want to you can easily integrate into Modx as well.
Thanks