I have built something to keep track of all these courses http://www.class-central.com. Currently tracking just Coursera(Stanford's online learning initiative) courses, but would be adding UDACITY and MITx courses(when they are announced) soon.
Summary of Stanford's online course offerings(not affiliated with Stanford)
should be:
Summary of Stanford's online course offerings (not affiliated with Stanford)
Great work collecting it. I would do some user-tests on the landing page though. It needs a tiny bit more content and a clearer 'best path' call-to-action.