Robert Frank - The Economic Naturalist's Field Guide
Better than most in the pop-economics genre. This book actually managed to apply principles to real world problems.
James Gleick - Faster: The Acceleration of Just About Everything
I honestly didn't really think this was worth reading.
Steven Johnson - Ghost Map: The Story of London's Most Terrifying Epidemic - and How It Changed Science, Cities, and the Modern World
This book is fantastic, it reads quick and is incredibly smart.
Liaquat Ahamed - Lords of Finance: The Bankers who Broke the World
The story of the major financial players in the US, France, the UK, and Germany, starting at the turn of the century and on through the great depression. It is hard to describe how badly these guys fucked up without it being a gross understatement. Ahamed took 500 pages to do just that. I won't try.