The HD video was a bit choppy and stopped a lot more than Netflix. Maybe a lot of people are trying it out and their servers are busy. Not sure.
Edit: I guess my connection might have been slow (although I have no reason to believe that). I'll give it a try again later.
Spent the weekend grading exams, finally finished! Now for some not very fun administrative stuff (I have about 100 emails to forward and/or respond to about a summer program I run). Sigh.