Wise crowds
(This is a reprint of the original post)
I've finished reading The Wisdom of Crowds, by James Surowiecki (more on this book in its wikipedia entry). I found it enjoyable, with lots of shocking data from experiments. I think the author makes a number of interesting points, and there are obvious connections with the latest trends on the Internet (the social web). By the way, I bought this book because Labra told me about it.