It's amazing to see the amount of educational and university resources online. You can sign up for some great email updates.
Here are just a few more to add to the list:
Openculture.com - Claims to be "The best free cultural & educational media on the web"
Futurity.org - "Discover the Future from Leading ResearchUniversities - An online news source featuring the latest discoveries in science, engineering, the environment, health, and more from North America's leading research universities."
Academic Earth - "Free academic video courses from leading universities"