From Education Week:
Larry Sanger, who co-founded the Web site Wikipedia, has launched a site that provides free access to a library of educational videos for students ages 3 to 18. The site -- www.watchknow.org -- features links to more than 11,000 videos in 2,000 categories that include history, math, science and other subjects. Sanger described it as "YouTube meets Wikipedia."

This looks great-- Thanks for the link!

This is so cool! Thank you for posting the link.