There are also guest lecture videos in addition to the course material videos, and I watched one today. Unlike the course videos, which are one or both of the instructors talking directly to the camera, this was a taping of a class lecture, complete with student questions and responses, both as generated from the material and as a result of instructor prompting.
No women spoke, in so far as I could tell. Not to ask; not to answer, even when the professor prompted people who hadn't spoken yet to join in.
There was only one brief shot of the class, and I did see women among the students in the audience hall. Not too many; my visual recall is perhaps three of thirty in the snapshot I remember, and I'm sure (or at least I hope) I missed some. I hope I'm wrong; I hope I mis-identified vocal timbre or something.
Because otherwise, really? Still? In 2012? What the hell is going on, and where are the women participants? Obviously it's bugging me, and I don't think it's entirely because no-one raised the questions I had and was hoping would come up; I certainly don't think I have particularly gendered questions. It hit my awareness gradually about half way thru the 45 minute running time, and then I started paying closer attention. It's hard to guess what extenuating factors there might be, but it did make me feel ...odd.