Powerful: Building a Culture of Freedom and Responsibility by Patty McCord
Netflix is, to me, the most interesting petrie dish in the study of workplace culture. Somewhere between Amazon's Darwinianism and Zappos' anarchic self-organization, there is Netflix. Decency, responsibility, ultra-high-performance. Patty McCord worked side-by-side with Reed Hastings to make it happen and here she tells her story. (Her interview with Barry Ritholtz for Masters in Business is excellent too if you want a quick taste.)
PS - This book should be much much bigger than it is. (All by itself, it's a case study in how publishers still add value and how business profile can be aided by a publisher who knows how to amplify it.) Anyone who cares about company culture should read it.