I had to rapidly teach myself Linear Algebra to get through some machine learning graduate courses, and Strang's book and video lectures saved me. He has a very special talent for making complex material understandable without dumbing it down. He's up there with Norvig and Feynman for me in terms of teaching talent.
That man with a piece of chalk and a big chalkboard beats any PowerPoint presentation or video presentation using animation and whatever other technological helps you can think of.