This book was on my queue to read for quite a while.
The Wisdom of Crowds by James Surowiecki was both interesting and bit long-winded. Some chapters were entertaining to me and others put me to sleep. Let me summarize the book in a single sentence.
Crowds will arrive at a better answer than individuals if they gather their information independently.
Now if you would like 270 pages of explanations and examples, go read the book.