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Gordon R. Meyer
Wiki-based Documentation: Tastes Great, Less Filling
The article The Trouble with Delivering Product Documentation in Wikis—and Some Better Alternatives by Paul Wlodarczyk pretty much tells you everything you need to know in its title. Wlodarczyk refers to "some Linked In posts" discussing how to publish documentation using a wiki, and then expresses a view that can be summarized as "wikis are not commercial content management systems." Well, he's right, but in situations where a pricey, hosted service isn't necessary, you might turn to the open source world for working examples of wiki-based documentation. You don't have to look too hard, but TinyMCE, Cisco's Documentation Wiki, or any site using DokuWiki would be a good start.
See also An Example of Wiki-based Instructions.