My retired father had been following the archives for "Learn to program: The fundamentals", and after completing 3 weeks of work, the coursepage was suddenly taken down (https://class.coursera.org/programming1-001/class). It looks like they just started a new iteration of the course and decided to remove the old one without notice. Needless to say, this experience took away from his belief and excitement in online learning (something which he had recently discovered).