PeepCode as I mentioned previously is quite an inspiring idea, and quite useful for learning new things about software in a fairly straight forward easy way. I bought a few of these a couple years back and liked them. I have to admit I mostly forgot about PeepCode until recently when I visited their site and found a screen-cast on making screen-casts and the software they use. Since I have done a few myself I was hooked and had to know what they are doing.