Going beyond "just" videos and multiple-choice quizzes, the MITx folks built/assembled an impressive array of mostly web-based tools (e.g. a 3D molecule viewer, a molecule editor, a simplified version of genome viewers used by actual biologists) to support the learning enterprise.
Here's a glowing review that (unlike my scribblings here) starts to do the 7.00x experience justice: http://okazakifragments.wordpress.com/2013/05/29/the-best-mo...
However, I must add that when I tried to use Scala in the real-world, it was considerably more complicated due to implicits, CanBuildFrom, and other "invisible hands" (not merely synactic sugar, mind you).
Introduced me to some new ideas about learning, and solidified some ambiguous thoughts I already had. Much fun.
I've been able to do the whole course, but only because i have good math skills. My impression is that math skills (calculus and linear algebra) are much more needed than coding skills in this course.