Here's my suggestions:

• Freakonomics is a fun introduction to economics. It has some caveats (most high-level economists disagree with the book) but I think it's a great way to get excited about economic concepts and see some of the things you can do with them.
• There are a bunch of excellent topic-focused lighter-reading economics books such as: Wikinomics, The Wal-Mart Effect, and Predictably Irrational, to name a few.
• I know you said "pop-sci" but if you're into mysteries at all then there's a fun series of two books written by a pair of economists called Murder at the Margin and Fatal Equilibrium. The books are murder mysteries in which the main character solves the mystery using economic principles. They are a little silly but an entertaining read.
• If you're interested in something a little more hands on there are a number of free (low expectation) online introductory courses. The University of Illinois in particular is offering a completely free course in Principles of Microeconomics. It's fairly unorthodox and should be both fun and informative. I highly recommend it from personal experience.

Hope that helps!