In the most recent SIAM News, there is an article on mathematical fiction. I read it and added several more books to my reading list. I was pleased to see that Kasman's list included Clifton Fadiman's Mathematical Magpie, which was one of the books I enjoyed from the Bel Air library when I was in high school.
Actually, most of the SIAM News book reviews make interesting reading. I should add that the books are usually accessible to a non-specialist audience. Quickly browsing through recent issues, I was also reminded of Philip Davis's review of a book of scientist's diaries. And now my reading list is even longer.