Cryptonomicon
I read this book on an international trip, and it was a good choice for that. Its long (around 900 pages), but very readable. This is the second time I've read the book, and this time its amazing how well the description of Silicon Valley startups matches my experiences there. I love this book. Update 2022: having now read this book for a third time, I have to say it does stand the test of time. However, having read the rest of the Baroque Cycle now, I do wish somewhere in the series more attention was paid to explaining Enoch Root's back story.