The Scholastic Instructor Winter 2011 issue lists http://learner.org/ as number 21 in the list of "25 Best Websites for Teachers". Personally, I'd put it up there at number 1! I've just spent an hour-and-a-half at the site, and the topics, interactives, and full courses just blew me away! If I only had $196 on demand, I would register for a course credited in Columbia University.
The most fun I had was at the Physics Interactive Lab http://learner.org/courses/physics/interactive/lab_interactives/subatomic.html, reminding me that Physics was indeed my favorite of the Sciences! Videos and other professional development resources are just a click away!
Here's hoping that teachers out there will get a "click" out of learner.org.
Resources for facilitators (anyone can facilitate!):