I enjoyed Pragmatic Thinking and Learning (http://pragprog.com/book/ahptl/pragmatic-thinking-and-learning http://pragprog.com/book/ahptl/pragmatic-thinking-and-

I enjoyed Pragmatic Thinking and Learning (http://pragprog.com/book/ahptl/pragmatic-thinking-and-learning http://pragprog.com/book/ahptl/pragmatic-thinking-and-learni...). It's quite accessible, and doesn't feel too pop or new age. If you're quick, you can get it rather cheaply during the Black Friday sale. (http://media.pragprog.com/newsletters/2011-11-21.html http://media.pragprog.com/newsletters/2011-11-21.html)