From the conference session, here is the list of tools shared through chat:

Go2Web20.net (the complete Web2.0 Directory)
http://www.go2web20.net/

TagCrowd (web application for visualizing word frequencies in any user-supplied text by creating what is popularly known as a tag cloud or text cloud.)
http://tagcrowd.com/

Gliffy
www.gliffy.com

PB Wiki Questions and Suggestions
http://edisontechforteachersspring2008.pbwiki.com/PB+Wiki+Questions+and+Suggestions

Wikis in Plain English from YouTube (video)
http://www.youtube.com/watch?v=-dnL00TdmLY&feature=related

WikiMatrix (let’s you compare different wikis)
http://www.wikimatrix.org

What Is Web 2.0 (article by Tim O’Reilly)
http://www.oreillynet.com/pub/a/oreilly/tim/news/2005/09/30/what-is-web-20.html

WeblogMatrix (compares weblogs)
http://www.weblogmatrix.org/

Share documents without doing PDFs
http://www.scribd.com/