How about something from US or European History?
Want to know a little more about biology or chemistry or physics but either don't have your old college textbooks or don't feel like cracking them open?
Never fear. Be sure to check out the Khan Academy.
With over 3,500 videos on a variety of subjects, from the ones noted above to dozens upon dozens of others, this is the epitome of FREE EDUCATION at its finest. One can earn accomplishments the more videos you go through, as you increase your knowledge about any number of topics.
Want to know more about black holes or the birth of stars? How about an in-depth look at microeconomics?
Then check out the Khan Academy.