I'm signed up for CS50x and 6.00x (Introduction to Computer Science).<p>6.00x has started and is great. It's taught in python, which I've had some exposure to before (having done the exercises in Learn Python The Hard Way). So far, I'm finding edX's delivery to be superior to Coursera's. I'm looking forward to starting CS50x.<p>My housemate started the 6.002x course last session, and said it was great (but did not have the time available to finish it).