Creating Documentation With A Wiki: The DITA Storm Project
DITA is natural. Do XML/DITA conversion research now. Wiki is especially good for iterative writing. Structured wiki authoring in coming.
Abel, Scott. SlideShare (2007). Presentations>Documentation>Wikis>DITA
Thinking Outside the Book
The notes for a presentation (titled Thinking Outside the Book: Wikis for Writing and Delivering Documentation, that discusses the whys, the tools, and the techniques of using wikis for documentation.
Nesbitt, Scott. DMN Communications (2009). Presentations>TC>Wikis>Documentation