Here are links to the Web 2.0 tools that I shared at NECC. Video of the presentation can be found here.
Browser
Firefox
The dictionary add on for Firefox browser:
http://www.thefreedictionary.com/add2ie.htm
Blog Tools
Blogger.com (blogspot)
Edublogs.org
WordPress.com
ePals.com
ESL examples:
http://dvmunca.blogspot.com/
http://esl5.edublogs.org/
Wikis
Pbworks.com (Formerly Pbwiki)
Wikispaces.com
Wetpaint.com
Social Networks
Ning.com
Twitter.com
ePals (Collaboration Center is not yet available)
Web Media Tools
Gcast (used w/Audacity)Slideshare.com
VoiceThread.com
Skype.com
SchoolTube.com
Ustream.tv
PicNik.com
FotoFlexer.com
Flickr.com
MakeBeliefsComix.com
ToonDoo
Others to try
Kerpoof.com
Glogster.com/edu
Voki.com
Vocaroo.com
YackPack.com