illustrated tutorial for getting started using coComment, a web application for comment tracking, notification, and community building, used for the 31 Day Comment Challenge (May 2008):
http://commentchallenge.wikispaces.com/
"Pics4Learning is a copyright-friendly image library for teachers and students.... Unlike many Internet sites, permission has been granted for teachers and students to use all of the images donated to the Pics4Learning collection" (About Pics4Learning, 2008.09.03).