"The Starfish and the Spider," The Unstoppable Power of Leaderless Organizations by Ori Brafman and Rod A. Beckstrom.
It's about the differences between centralized organizations (most companies) with an organized "head", and decentralized ones (like Wikipedia), where everyone involved has a say in determining the direction, and the strengths and weaknesses of each. I found it most thought provoking.
-Gerard

