I came across a great website for brushing up on little ideas, like the the Laplace Transform, Ideal Gas equation; everything from Algebra to Evolution to the Geithner plan. Short snippets are done Camtasia-style, with no face, just talking over Khan Academy was founded by Salman Khan (Sal) with the goal of using technology to educate the world. Everything is free. An NPR interview with Khan is here. He worked for a hedge fund, and has technical degrees from Harvard and MIT.
I think in the long run, these are going to replace technical teaching. Khan is a very good teacher, and he's teaching things that aren't smushy like history or economics, so I think the subject is more like a commodity.
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