Henry,

The three free wikis that seem to get most press are

PBWiki - http://pbwiki.com/
SeedWiki - http://www.seedwiki.com/
Wikispaces - http://www.wikispaces.com/

My preferred tool is Wikispaces. See http://flnw.wikispaces.com/ for an 
example of what it can be used for.

- Michael Coghlan

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