Sure, YouTube has a lot of drivel. But, online class lectures are becoming more popular on the video-sharing mega site. Here's what the Chronicle of Higher Education has to say about online lectures on YouTube:

"Even YouTube was surprised by how popular the colleges' content has been, according to Adam Hochman, a product manager at Berkeley's Learning Systems Group. Lectures are long, after all, while most popular YouTube videos run just a few minutes...Yet some lectures on Berkeley's channel scored 100,000 viewers each, and people were sitting through the whole talks. "Professors in a sense are rock stars," Mr. Hochman concludes. "We're getting as many hits as you would find with some of the big media players."

If you haven't explored YouTube's educational videos, take a look. It offers online lectures from colleges such as UC Berkeley, the University of Southern California, and Vanderbilt.