A new Jython book will be published by Apress this fall entitled 'The Definitive Guide to Jython with Django'. Authors include Jim Baker, Frank Wierzbicki, Leo Soto, Victor Ng, and myself.
This book will be of interest to those beginning Jython and also to advanced users. We will also maintain an open source version of the book online.
I'm looking forward to working with these talented individuals and assisting in the documentation of Jython.