Learn about google docs
What is a google docs?
Watch the following video from youtube: Google Docs in Plain English
Once you get past the 1st 3 seconds of this video, there is a good explaination of the cons for collaborative learning for students and educators.
This case study explores how Google Docs makes it easy to create content and involve other users
Google Docs Help Center
Take a tour at: http://www.google.com/google-d-s/tour1.html
You can also visit the Google Docs Help Center at http://docs.google.com/support/