Aaron Digulla wrote a great post about XWiki after seeing Vincent's (@vmassol) XWiki presentation at Jazoon. He really understood the geist of it and the possibilities XWiki opens up for developers and organizations.
Here's an excerpt from his post:
"With XWiki, you can finally annotate data in your corporate database with a wiki page, with all the power of a wiki and you can even display the data set in the wiki and edit it there. Granted, the data set won’t be versioned unless your corporate database allows that but it’s simple to do the versioning in the data access layer (for example, you can save all modifications in a log database).
Suddenly, possibilities open up."
You can find the full post on his blog.