Add another one to our collection: Intelligent Life at YouTube: 75 Educational Video Collections
UCLA has brought their videos to YouTube, joining a growing number of other well-respected cultural and educational institutions. Compared to other newcomers, the initial set of videos (see the UCLA collection here) is reasonably strong, and I suspect that it will get more substantive over time. Straight off the bat, I'd point you to a longer course that you can watch online. It's called Life, Concepts & Issues, and the first video appears below.
While on the topic of YouTube, I want to mention that I've been working at Stanford on a fun (and also free) media project that we'll be rolling out next week. Stay tuned for more details.