The Pragmatic Programmer

A great book presenting the best practices of what it takes to be a great developer. I'm reading the book while already knowing quite a bit of the topics discussed, but the book still managed to surprise with little bits of additional insight or perspective. I find the way the things are discussed to be very accessible and fun to read. Every developer looking to learn about best practices (and not just to blindly follow them, but understand the principles behind them) should read this book (among others).