Some of the greatest minds in the security research and hacking community, including a couple of prominent jailbreak developers, have put together a new book called The iOS Hacker's Handbook.
The book is a collaboration between infamous security guru Charlie Miller, Dion Blazakis, Dino DaiZovi, Vincenzo Iozzo, and Ralf-Phillip Weinmann. Stefan Esser (better known as "i0n1c" in the jailbreak community) is also listed as an author. The Dev Team's MuscleNerd served as the book's Tech Editor.