Here is a repost from almost two years ago. With all the discussion on social media and crowd sourcing of information, I thought a repost of this was timely:
Joel and I both agree: one of the most effective coding practices you can adopt on your team is interactive, sit-down-with-your-coworker code review. 90% of the things you will learn have nothing to do with the code. I believe programming is a far more social activity than most realize. If you write code, and nobody but you ever sees that code — did you really extract all the benefit from writing that code?