Silence on the wire : a field guide to passive reconnaissance and indirect attacks by Michal Zalewski. No Starch Press, 2005
This book on internet security is much different than most. Firstly, it is a joy to read! It has no dry descriptions of the latest vulnerabilities, but instead it delves into the technologies that underlie the Internet, and explores their inherent limitations.
Professional Python frameworks : Web 2.0 programming with Django and TurboGears / Dana Moore, Raymond Budd, William Wright.
If you are developing web applications using Python you will want to use a framework so you are not re-implementing all the ‘glue’ that is common to all web apps and so you have a clear project structure to work around. This book is an excellent introduction to two frameworks, TurboGears and Django.
More info is at the Library of Congress