I agree. Over the Summer I wanted to do the Python course with my son (9 years old) but it doesn't start until October, when he'll be back at school. Shame. Doing the Learn Python the Hard Way with him instead
Their interface is a lot better and their teachers are great, they've really created a new pedagogy around the new medium rather than adapt existing brick and mortar courses like Coursera and edX is doing. Mind you Coursera and MITx is a great way to get real college classes over the web, but Udacity is rebuilding the whole paradigm and is intensely analyzing data and tweaking to improve things.
http://www.udacity.com/overview/Course/cs101/CourseRev/apr20...
Also, you are awesome.