I love books that make me look at things from a different perspective.  Malcolm Gladwell's books (The Tipping Point, Blink) and Barbara Ehrenreich's Nickel and Dimed are, like Freakonomics, some of the best and most intriguing nonfiction I've read in the past year or two.

Freakonomics: A Rogue Economist Explores The Hidden Side of Everything takes conventional wisdom and turns it on its head.  By studying the incentives that drive the behaviors of people as diverse as crack dealers, sumo wrestlers, and real estate agents, genius economist Levitt and respected writer Dubner collaborate to bring to an understandable level how people get what they want and need, and how information can help break down the walls between the experts and the rest of us.

The chapter titles alone intrigue:
1.  What do schoolteachers and sumo wrestlers have in common?  (Cheating!)
2. How is the Ku Klux Klan like a group of real estate agents?  (the power of information)
3.  Why do drug dealers still live with their moms?  (myths about the drug scene and how benefits from perpetrating them)
4. Where have all the criminals gone?  (an unexpected side effect of Roe vs. Wade)
5.  What makes a perfect parent?  (It's more who you are than what you do!)
6.  Perfect Parent, Part II; or Would Roshanda by any other name smell as sweet?  (a look at how baby names have little impact on a child's success or failure)

There's a reason why the following is true: 
The New York Times Sunday Book Review commends Freakonomics for zeroing in on an odd milestone: second place on the list of books that have spent the most weeks on the Times nonfiction list in the last decade without ever reaching No. 1.

That would be because it's an incredible, insightful book that will leave you thinking about it for a long time to come.