If you guys find this interesting, check out a book called "The Works: Anatomy of a city"[1]. It covers almost everything that makes NYC tick. From freight channels, to how post offices route everything, to how water and electricity is generated and delivered to zip codes and land division. The book is filled with gorgeous info-graphics and illustrations. I sat in the book store for an hour flipping through it before buying it.

[1] http://www.amazon.com/dp/0143112708/