For me, I think the biggest one was Refactoring by Martin Fowler, which you can find here: http://refactoring.com/ http://refactoring.com/ This post almost see

For me, I think the biggest one was Refactoring by Martin Fowler, which you can find here: http://refactoring.com/ http://refactoring.com/ This post almost seems to be turning out to be an AskHN, with everyone chiming in on their 'career-changing' programming books.