I love reading commentary along with code, especially from the original authors. It's dated by now, but Beautiful Code[1] was a fun read. I really appreciated

I love reading commentary along with code, especially from the original authors. It's dated by now, but Beautiful Code[1] was a fun read. I really appreciated the chapter on the implementation of Subversion. 1: http://shop.oreilly.com/product/9780596510046.do http://shop.oreilly.com/product/9780596510046.do