Wikis for collaborative authoring?
Once way to look at Wikis is as a replacement for traditional documentation released in sync with versions. This may make sense quite often.
Another way to look at Wikis is as a way to do collaborative documentation.
Following a line of reasoning suggested by David Weinberger, in many cases it makes sense for tech writers to post drafts of the docs they’re working on themselves (non-collaboratively), using the Wiki infrastructure to open up the drafting process — getting comments/additions/changes from whoever edits the Wiki oontent. In this scenario, the tech writer still “owns” the content, but leverages the collective wisdom/inputs of a larger community to improve his or her deliverables.