My thoughts are this. Two things prevent wide spread buy-in to web 2.0 technologies. Apathy and Fear. Not much can be done with apathy. Much can be done with fear. I am currently on the search for a definitive guide to starting and maintaining a classroom blog. Something that will walk a scared, non-believer through the first steps of working with the AUP and working with the class on web safety, to their first sign up with a web service, configuring the site, and then maintaining it. I wouldn't so much care about which service the guide used so much as it's free. Something that could be wide-spread distributed. Maybe one does not exist. Maybe it's a job for the wiki. Let me know if someone has something that is close.