Wikis that use MoinMoin:
this one
[wiki:FrontPage IRC channel #c]
[wiki:FrontPage IRC channel #c++]
[wiki:FrontPage IRC channel #python]
[wiki:FrontPage IRC channel #xml]
[wiki:Python20Info Python 2.0 Info Area]
[http://www.sh.rim.or.jp/~yasusii/ YasushiIwata's Home Page] (Japanese - gives a 404 error ... should be deleted?)
[http://www.bioinformatics.org/piperwiki/moin.cgi Wiki for the Piper project]
[http://pgdn.org/wiki CultureWiki] (online again, but still dead)
[http://compsoc.dur.ac.uk/~tsp/cgi-bin/triki.cgi TrikiWiki] (private wiki for the Transformers holiday - uses a mildly hacked MoinMoin)
[http://www.keitee.net/ Keiteedot] (Slash like wiki in Japanese)
[http://www.gembook.org/moin/ WikiArea] (Japanese)
[http://www.cdegroot.com/cgi-bin/photowiki/ Photo Wiki]
[http://www.cdegroot.com/cgi-bin/moin/ cdegroot.com's MoinMoin]
[http://www.bcwireless.net/ BC Wireless]
[http://www.alberg30.org/collaborate/ Alberg Wiki]
[http://www.linuxvideo.org/docs/wiki/ LiViD Wiki]
[http://gstreamer.net/wiki/ GStreamer Wiki]
[http://lightingwiki.com/FrontPage The Lighting Wiki]
For more wikis, see the InterWiki list.