Great book on the innovations that Google is doing, not limited to technology.
Really agree with the social, economic landscape changes that they are leading.
Was surprised that I have already read majority of references used in this book..

The Long Tail, Chris Anderson
Here Comes Everybody, Clay Shirky
Small is the New Big, Seth Godin,
The Wisdom of Crowds, James Surowiecki


Some other books that I've read in context,
The Big Switch:Rewiring the world from Edison to Google, Nicholas G Carr
The Future of Reputation: Gossip, Rumor, and Privacy on the Internet, Solove, Daniel J.
Groundswell, Charlene Li,Josh Bernoff
Six Pixels of Separation, Mitch Joel
WE-THINK : MASS INNOVATION, NOT MASS PRODUCTION,Charles Leadebeater