In the video from Sun that was posted on Atlassian's blog recently the following comment, that to me is the real power of wikis, was made.
"Publishing now belongs to the community"
I completely agree. The problem I see however is that the content authored, while mostly aimed for publishing on the web, is authored or stored as "Wiki Text". Like Doug, I'm amazed that wiki markup is not seen as "arcane" in the same way as the original layout languages.