Picture of the Day
Astrobiology
Videos on Astrobiology by the Education and Training in Astrobiology working group of the International Astronomical Union. These include two video MOOC series, one on Astrobiology by Charles Cockell of the University of Edinburgh and the UK Centre for Astrobiology (also available on Coursera) and one on Jovian planets by Alessandro Morbidelli and Sean Raymond. I watched both series at thoroughly enjoyed them!
Earth History
American Natural History Museum, especially the PondLife series