Goedel, Escher, Bach -- If you're reading this page you will dig this book.
Guns, Germs, and Steel -- how circumstance drove civilizations. Fun storytelling even if it's a bit too "just-so". definitely trains you to look at any situation and seek it's origins with less initial judgement.
The Visual Display of Quantitive Information -- gets at the essence of communication and medium. more than it seems!
The Alchemy of Finance -- "reflexivity", but if you're also interested in Soros or some finance storytelling it's worth it.
The Selfish Gene -- as everyone else has said.
The Prize -- the history of oil. huh? yeah. Likely to change how you look at the history of technology, government, power, the saudis, and geopolitics.