Wikis
A type of website that offers collaborative authoring.
JotSpot
http://www.jotspot.com/
A series of web-publishing collaboration tools including calendars. spreadsheets, documents and photo galleries purchased by Google.

PBWiki
http://pbwiki.com/
Has a wiki area for Educators.

Wikia
http://www.wikia.com/wiki/Wikia
A place for communities to come together to create, share and discover topics they are passionate about.

WikiBooks
http://en.wikibooks.org/wiki/Main_Page
A Wikipedia project created to develop a free collection of open-content textbooks that anyone can edit.

Wikipedia
http://wikipedia.org/
On-line encyclopedia created and edited by Internet users. Good source for current opinions on popular current events and topics.

Wikispaces
http://www.wikispaces.com/
Creation of simple web pages that groups, friends, and families can edit together.

Wikispaces for the classroom
http://www.wikispaces.com/site/for/teachers100K
Wikispaces is giving free accounts to 100,000 teachers.
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