An Interview with John Foreman, Chief Data Scientist at MailChimp
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http://www.amazon.com/Data-Smart-Science-Transform-Informati...
It's one of the few books on the subject that doesn't get bogged down with mathematical notation, nor does it cheat with "And Then A Miracle Happens" library calls. The book is primarily aimed at business analysts, but programmers can get a lot out of it too.