A few I read:

Design is Job - Mike Monteiro by A Book Apart (Really basic stuff for people starting with agency/freelance work, but really good).

Learn Ruby The Hard Way for people starting.

Applied Cryptography, Second Edition: Protocols, Algorithms, and Source Code in C

Baked In from Alex Bogusky and John Winsor (About C+P agency)

I'll try to think of a couple more.