Patrick has assembled quite a collection of Math videos Dealing with Algebra, Trigonometry, Probability and Statistics and the college level Calculus sequence. There's probably some Graduate level instructional as well but I'm not sure. His site is comprehensive and useful for people that want to work on basic Math skills or just observe Math problem being solved. He also seems to be a natural teacher and that is the wonderful thing about his site. And it's all for free! What a nice guy.