Wikis

Tutorials:
Wikis in Plain English - http://www.commoncraft.com/video-wikis-plain-english

Links to Free and Paid Wikis:
WikiSpaces - http://www.wikispaces.com/
PB Wiki - http://pbwiki.com/
Wet Paint - http://www.wetpaint.com

Links for Wikis in the Classroom:
Whose Blog is it Anyway?
Teaching Tips with Wikis in the Classroom

Wikis is Higher Ed:
UWT Technology Sandbox
Wet Paint Wikis in Higher Ed
Wikis in Higher Ed the Pros and Cons
Teaching with Wikis in Higher Ed
The Power of Wikis in Higher Ed - Stewart Mader