In addition to the list of more than 5000 free mathematics and physics videos and tutorials I shared last year, you may want to add the Vi Hart‘s Math Channel in Youtube. Vi Hart has created recreational math videos and mathematical doodles in fast-paced narration. The channel has more than 200,000 subscribers and has been viewed more than 16 million times as of this writing.
The math video above is the part 1 of 3 of the Fibonacci sequence and Spirals series.
Vi Hart calls herself a recreational mathemusician. She was born Victoria Hart, a music major who is passionate about mathematics. She is currently working at the Khan Academy but continues to maintain her own video blog.
If you are a lover of numbers, Numberphile might be a good site to visit. Numberphile contains videos about number facts, trivia, and applications. The video below about leap years is one of my favorites.
Mathematics Illuminated is an amazing multimedia resource created by Annenberg Media. It contains text articles, videos, and java applets that discusses mathematics ranging from the most ancient to the most modern. The title of 13 chapters are the following.