Salman Khan that is. Creator of the Khan academy. Who did you think I was talking about?
I have asserted before that the best resources the internet has to offer are free. Wolfram alpha, podcasts, Wikipedia and the Khan academy are but a few examples. Hosted on youtube.com Salman has produced over 1,300 short (10-20 min) videos in 32 Categories. I stumbled across the site while researching haemoglobin (a component of red blood cells). Salman created a 14 min video explaining haemoglobin and it is just one of 58 biology oriented videos. Other topics include mathematics (from 2+2 to advanced calculus), physics, human anatomy & physiology, chemistry and economics just to name a few.