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Inside the Black Box:

http://www.amazon.com/Inside-Black-Box-Quantitative-Trading/...

Seconded.

Here is where the coders of Wall street can help us understand--making their efforts more transparent. They dont have to reveal details of their code--but a few blogs about what they are doing, what they are achieving, and they aim for would be nice

Capital Vol. 1 by Marx is classic and still more applicable than anyone wants to admit. Ease into the terminology over the first few chapters, things are defined carefully.