Ward's Wiki remains one of the most popular Wiki sites:
Some more historical information would be good; info about the wiki ethos; about the varieties of wiki software; about the various (many) wikis now online. Wikipedia seems like a natural place to develop an article on the subject of wikis!
Please see http://c2.com/cgi/wiki?WikiHistory and, if Ward's wiki is open content (is it? See http://c2.com/cgi/wiki?WikiCopyRights), let's just swipe the whole thing. Otherwise, we can do some research using that page, anyway! :-)