OT: His online Machine Learning class last year was great. He is the best professor I've ever had, and explains things so clearly that you understand them the first time. You are lucky if you ever get to work or study under him.
Also, I believe it's still possible to join the current session (first assignment was due this weekend, but you can turn it in late with just a 20% penalty.)
It is one of the best Coursera classes. I had a blast, and strongly recommend it. I decided to continue learning ML, mostly because Prof. Ng.