For those not familiar with a MOOC: a MOOC is nothing more or less than a Massive (many participants) Open (it is free to all, anyone can join) Online (the course can is fully web-based) Course.This format has been used a couple of times by George Siemens and Stephen Downes in their CCK (Connectivism and Connected Knowledge course) and the LAK11 course on Learning Analytics.

An overall site on MOOCs can be found here (really new, so still a bit under construction):

And if you never heard of a MOOC, feel free to watch Dave Cormier's video underneath (give the video a moment to load).