Leopard packs a new wiki server
http://www.apple.com/server/macosx/leopard/wikiserver.html
No clue as to which one they chose, though. But assuming they keep to previous pattern, it will be one of the BSD-licensed, open source ones. But that's a pretty slick UI they put on top of it, I must say.
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Jonathan Nolen 
It looks like they wrote their own. My first impression is that it’s quite shallow on features, but what features are there (WYSIWYG, basic tagging) are implemented in a slick AJAX-y fashion.