(NOTE FROM H.E.L.P. ADMINISTRATOR: Apparently this site has had connection issues from time to time (as noted in blog notes from 2007 & 2008). I visited & reviewed the site in late April, 2009 so hope

CK-12 Foundation is a non-profit organization with a mission to reduce the cost of textbook materials for the K-12 market both in the U.S. and worldwide. Using an open-content, web-based collaborative

Learning is Sharing Find Free-to-Use Teaching and Learning Content from around the World. Organize K-12 Lessons, College Courses, and more. Open Educational Resources are all about sharing. In a