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http://stackoverflow.com/questions/1711/what-is-the-single-most-influential-book-every-programmer-should-read

http://stackoverflow.com/questions/1177724/what-soft-skills-make-a-great-programmer

http://stackoverflow.com/questions/330412/which-books-made-you-a-better-programmer
http://stackoverflow.com/questions/67794/what-skills-are-worth-learning-for-a-programming-career-and-or-resume

http://stackoverflow.com/questions/503325/what-makes-a-great-programmer

http://stackoverflow.com/questions/294825/what-skills-should-a-programmer-have-nowadays
http://stackoverflow.com/questions/605913/top-developer-skills

http://stackoverflow.com/questions/184310/do-you-ever-feel-confident-in-your-skills

http://stackoverflow.com/questions/1490346/how-to-compare-programming-skill
http://stackoverflow.com/questions/82639/how-to-become-a-better-programmer

http://stackoverflow.com/questions/62960/what-are-the-basics-of-networking-sys-administration-should-a-programmer-know
read them all!