Try "The Book: Playing the Percentages in Baseball".
It's examples are a bit old, but the theory is all there. Tango and Litchman are two of the biggest figures in the field, and, I believe, now both have gigs with big league clubs. Tango also runs a blog which sometimes has really good discussions of sabermetric stuff, but it's probably best to get your feet wet with the book first.
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