PBwiki – Free Wiki for Business, Education and Personal
http://pbwiki.com/

PBwiki is the world’s largest provider of hosted business and educational wikis. They host over 600,000 wikis, serve millions of users per month, and 96% of PBwiki business users would recommend PBwiki to a friend. PBwiki’s headquarters are in San Mateo, CA, with a branch office in Nashua, NH. Leading organizations from Depaul University to the FDA, choose PBwiki to help them with knowledge management, collaboration, project management, and a host of other business processes and workflows. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.