I recently received my "desk copy" of the new book Algorithmic Game Theory, edited by Nisan, Roughgarden, Tardos, and Vazirani.
While I haven't read it cover-to-cover yet, I'm very impressed by the book. It's taken a large area with a fairly short history, and broken it up into reasonable-sized chunks each written by an expert, with most chunks covering a new and active research area. For example, Michael Kearns writes about Graphical Games, Christos Papadimitriou explains the complexity of finding Nash equilibria, Jon Kleinberg discusses cascading behavior in networks and the corresponding economic issues, Ramesh Johari and David Parkes and Joan Feigenbaum and so many others have chapters on their specialties, and so on. Overall I count 45 contributors! The result is a solid tome that really combines breadth and depth to create a resource that I assume works well for people working in the area and is certainly useful for an outsider trying to look in and see what's going on. There are also exercises in some chapters; it could certainly be used as a textbook.
What other topics could benefit from a treatment like this?