The Atrocity Archives (Charles Stross)

This is Stross's first published novel, and it's a delightful geekfest, encompassing everything from Pinky and the Brain to the Church-Turing conjecture and Knuth's fourth book, which was written but classified. The basic idea is that some advanced forms of computation destroy entropy rapidly (tying in with the Gleick book I read recently), which tunnels through to another universe and, depending on the details, summons anything from a demon you can control to a universe-destroying monster. Shannon meets Lovecraft! The narrator is part of a super-secret British agency, part James Bond and part ISO 9000, triplicate form bureaucracy, trying to protect reality from this kind of thing. How can a geek like me not love a book where the hero works in an office of twisty little cubicles, all alike? (If that means nothing to you, you'll miss half of what the author tosses out in this novel.) I enjoyed it quite a lot.