Okay, this is very cool –
You can now get college lecture videos off the web for free. The primary disadvantage, in comparison to going to college, is that you don’t get to hassle the teachers.
The difference seems to be that Open Culture is organized more like a blog, apparently with links to off-site material, while Academic Earth has all their own videos that they put together in-house.
So expect consistency from Academic Earth, and variety from Open Culture.