Class Central is a MOOC (massive open online course) aggregator from top universities like Stanford, MIT, Harvard, etc. offered via Coursera, Udacity, edX, Venture Lab and others and has a section on Health & Medicine MOOCs.
Coursera offers a wide range of free interactive online courses from top universities, including, nutrition, health promotion, patient safety, statistics, anatomy, neuroscience, pharmacology and other courses pertinent to medicine.
This world famous website is not specifically dedicated to medicine or health care, but to the spreading of ideas relevant to the world in general. It has speeches 10 to 20 minutes long from the most prominent people in their fields including education, technology, health for the general public, world issues and more.