This book was presented in exactly the way I like pop-math books to be written--with loads of pop-science examples. The math involved was just the right proportion of actual equations and examples, without reminding one too much of the text book she ought to be working from instead of reading popular books. As an overarching thesis, of course, the book is concerned with mathematics as a model--examples such as the Traveling Salesman Problem, Instant Runoff Voting, and the thermodynamics of melting ice abound--but Stein also isn't limited by his thesis. Meaning that he gives plenty of weight to Cantor's infinities, Godel's incompleteness, and other lofty mathematical ideas. Therefore, what makes this book superior to other pop-math books is that Stein interweaves the ideas of topology with relativity, gives dramatic historical anecdotes about solving cubic polynomials, and generally presents mathematics in some interesting or amusing context.
Not that math isn't already interesting and amusing, but cookies are better with chocolate chips.
I highly recommend this book for your daily requirement of analytical thinking.