There are a lot of popular books out there but few worth reading in their entirety. Here are a few that you should read yourself rather than relying on reviews.

Nonfiction

Black Swan by Nassim Nicholas Taleb…read if you don’t have the mathematical background to read Mandelbrot
Chaos by James Gleick…layman’s introduction to chaos theory
Freakonomics by Steven Levitt and Stephen Dubner…you probably read it already
The (mis) Behavior of Markets by Benoit Mandelbrot…beyond the normal distribution
The Modern Middle East by James Gelvin…essential for historical perspective on modern events
Twilight in the Desert by Matthew Simmons…great explanation of the oil industry

Fiction

Ender’s Game series by Orson Scott Card…political science, philosophy, and scifi
Pattern Recognition by William Gibson…creative plot about viral marketing