There is so much that I want to do here at CMS Report, but my time has been limited these past couple weeks. Some things that have been going on in my world:
I finally got around to reading this post. Deane, you get no argument from me but I wanted to add a few thoughts of my own.
We've used mediaWiki behind the firewall with some success. To be honest, I'm not in favor of the lack of WYSIWYG with strange wiki markup. I'm not in favor of creating the "instant links" created by contributors as it lacks some needed structure. I'm also not in favor of wiki-only applications as they don't offer the same growth in welcomed features as a full CMS. However...I think starting with a "wiki-only" application for many organizations is essential in developing a culture of collaboration.
My workplace has an extreme culture of control with regards to policies, memos, and official documentation. While collaboration isn't a new term, for organizations such as the one I work for, collaboration is still relatively new to put in practice. Full featured CMS can be confusing to users with regards to where on the Website they can edit other people's work and where they cannot. When users doubt they should be editing another person's work...they usually won't edit the work.
I do agree with Allan Thraen's comment/article that the difference between a Wiki and a CMS is psychological. However, I'll also argue that the difference is also cultural. If you have a CMS where traditionally you've placed formal controls on the content, then just adding wiki features to the CMS may not be enough to break the established control culture. In this case, you might want to consider adding a wiki-only site instead of integrating a wiki into a CMS.
Bryan Ruby is the owner and editor for CMS Report. He founded CMSReport.com in 2006 on the belief that information technologists, website owners, and web developers desired visiting sites where they could learn about content management systems without the sales pitch. Besides this site, you can follow Bryan at Google+ and Twitter.