The Kaiju Preservation Society, by Robert John Scalzi. [Edit: I'm not sure where I got "Robert: from - thanks, Autumnal!] I bought this one at a Barnes and Noble during the trip, as the second book I bought (on-line) didn't arrive in time, and I had heard good things about it. Having never read Scalzi before, I don't know how it rates with his other novels, but this was a light-hearted read about how nuclear explosions can cause the barriers between alternate worlds to fade, and the "next alternate world over" from ours is an Earth where the dinosaur-killing meteor never hit, allowing dinosaurs to evolve into kaiju: Godzilla-sized creatures who have their own biological nuclear reactors within their bodies and rely upon "parasites" (some of them are actually beneficial to the kaiju) to regulate their body temperatures and so on. The main character is a last-minute addition to a field team, so we get to learn everything through his eyes as he experiences them, and he's a good sort. The worst part about this book was I blew through it in a couple of hours (at the airport, start to finish, before I even got on the plane - bummer!)