I wrote this blog for harm reduction educators/drug and alcohol workers, about the use of Twitter to share learning obtained at conferences. Hope it is helpful. http://stonetreeaus.wordpress.com/2010/12/11/drugs-conferences-twit...
I ran across this blog this morning. http://steve-wheeler.blogspot.com/2009/01/teaching-with-twitter.html
One way that you can implement this into a classroom, is open it up for the more "technologically sound" parent to follow the twitter feed for the classroom. You can keep them up to date with the classroom going-on's, as well as send out reminders for when big assignments, or major events are due.