OK here is my status if anybody is interested.
I am in the class for week 2. I read the book, did the classes-quizzes, did the homework, completed for week 1 (AI only.)
I found the reddit discussion page. I joined reddit after procrastinating that for a long time. The most interesting discussion there (to me) was the one on how many signed up, how many viewed the you tubes, how many are likely to finish the class.
I also joined another study group with 11 people off metafilter and we are all together there in the google+ circle and the google wave but there has not been any real activity there yet.
I have pages of questions and probably will trickle them into the reddit page mostly. The class "discussion" page where I am presuming Sebastian and Peter and/or their TA's are actually going to read the stuff is not up yet.
Here you go: http://www.ai-class.com/
They're still working out kinks in the site, and no homework is up yet, but the initial set of lectures (really really basic "what is AI/welcome to the first day of class" type stuff is up), so if you signed up, then sign in and hopefully the site will work for you.