Just about all of the available Wikis suck really badly. The built wiki in FogBugz is OK and I think Wiki Server in OS X Lion is quite well done but will never

Just about all of the available Wikis suck really badly. The built wiki in FogBugz is OK and I think Wiki Server in OS X Lion is quite well done but will never get traction outside EDU. (I also worked with the Apple Wiki Server team for a bit so I am biased) Meadiawiki, pbwiki and Confluence are at the top of my list of wikis with really poor usability. I think the WYSIWYG editors are in most need of fixing (Write your own - if you can't do this you should not be building wiki software) followed by tracking changes and linking of documents together in a manner that allow you to easily track groups of interesting docs without being overwhelmed by updates after a certain point. The last thing the world needs is more poorly done wiki software so aim high :-)