Below are some links to articles, videos, and lists of resources that can help a teacher with ESL students in his or her classroom encounter the new idea of Web 2.0.
http://titova.ffl.msu.ru/for-teachers/web-20-tools.html
https://www.youtube.com/watch?v=NfpkVYXpvyE
http://ritasimsan.wordpress.com/
http://hcawebtools.wikispaces.com/Best+of+Web+2.0+for+ESL
Coli Escher 