I'd like to point everybody thinking about a Wiki integration (especialle a with MediaWiki) to a very interesting semantic Wiki:
semantic-mediawiki.org
It's an extension to MediaWiki and it adds semantics to it. There is avery active developer community. I'm actually looking for Zimbra users/admins/developers who have experience with Semantic MediaWiki.
A integration of Zimbra & Semantic MediaWiki is on my wishlist.
-Bernhard