PC Magazine in the US recently did a “short article describing Wikis”:http://www.pcmag.com/article2/0,4149,1402872,00.asp (web pages that anyone can edit just by typing simplified text into a form) and rated six options for making your own Wikis. One Wiki-related technology with some interesting unique features that is free to use and doesn’t get a mention is “Bloki”:http://www.bloki.com/ and probably the largest bit of Wiki content is the “Wikipedia”:http://www.wikipedia.org/ – a 300,000 entry user-generated encyclopedia.
Thanks to Many-to-Many for the link