I haven't had a chance to explore the three sites brought up in the article although Curriki recently came across my radar and I've got it on my Twitter feed. I went ahead and linked to them below. I still recommend the article. It has some useful information.
- Curriki: Online encyclopedia of free curricular materials
- National Science Digital Library: Science, math and technology resources
- HippoCampus: Multimedia courses and activites based on AP course content
[via Curriki (Tweet)]
[Image: "Working on Long Range Lesson Plans": Flickr: Uploaded on September 24, 2005 by CaptPiper: http://www.flickr.com/photos/piper/46059383/: Creative Commons: Attribution-Noncommercial]