COLLABORATIVE ONLINE LEARNING

What are the collaborative tools in e-learning??

For more information juz clik this link below:

http://en.wikipedia.org/wiki/Internet_forum (online forum)

http://wiki.org/wiki.cgi?WhatIsWiki (wiki)

http://sbinfocanada.about.com/od/onlinebusiness/g/podcasting.htm (podcasting)

http://en.wikipedia.org/wiki/Second_Life (second life)