Hadn't posted this before and an attendee mentioned it in a workshop: "Curriki, the online education community, is building the first website to offer free, open-source instructional materials for K-12. We have thousands of free worksheets, lesson plans, exams, project ideas and activities for English language arts, math, science, social studies, technology integration and other subjects. All of our educational material is contributed by teachers and partners and is free and open source."
I also hadn't seen this until yesterday's workshop... it's a list of Social Networks created for educational purposes, not unlike the list of wikis at http://educationalwikis.wikispaces.com or the list of blogs at http://www.supportblogging.com.
Click in to find related links.