Coursera is in the news this morning with commitments from 5 major universities (including one of my former schools, Penn) to offer free online courses.  Content here is college-level, and the intent is to teach the nuts and bolts with video segments, much as KhanAcademy does.  The education revolution appears finally to be gaining momentum.  I am experimenting with Khan for GED math concepts and with Buzzmath for middle school core standards with several adult students at Hutchinson Public Library.