Wiki vs. CMS (drupal, for example)

What *is* the difference between a wiki and drupal? Fortunately, D’Arcy Norman has already explored this topic in as much technical detail as is necessary. The truth is that the issue is control. A wiki requires a certain degree of loss of control, whereas with a CMS like drupal, there is a much less open nature to the processes available to the casual user. But I don’t think open-ness is necessarily a required characteristic of a wiki; services such as pbwiki allow wikis to be both private and public. If you were creating a specific project with a specific group, such as a group project in a class, it would be inappropriate to use a completely open-to-the-world wiki for the endeavor.
The most salient characteristic in my estimation is the extremely easy way one can create hyperlinks and format text in wikis. At the same time, as D’Arcy points out, creating a hierarchical navigation is a pain. Mediawiki can create one at the top of the page automatically as a table of contents, but I hate this feature from a usability standpoint. Basically, there is a reason we don’t use anchors heavily in websites, why bring this back with wikis?

What specific task or project would creating a wiki be a logical choice for?

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