The winner of the Estoril Global Issues Distinguished Book Prize 2011 was:
Charles Beitz - The Idea of Human Rights

The other three finalists were: 
Charles Kupchan - How Enemies Become Friends: The Sources of Stable Peace
Raghuram Rajan - Fault Lines: How Hidden Fractures Still Threaten the World Economy
Carment Reinhart & Kenneth Rogoff - This Time is Different: Eight Centuries of Financial Follies