The Definitive Guide to Jython: Python for the Java Platform has been published. This is a work in which five authors: Jim Baker, Victor Ng, Leo Soto, Frank Wierzbicki, and myself, began to author early in 2009. The book covers much detail on the Jython language and it's usage. It was a much needed addition to the library of Jython books that are available today as this book focuses on Jython 2.5.1...the most current release to-date. Many methodologies that hadn't been formally documented previously, such as the object factory pattern, with-statement, django and jython, and concurrency, have been documented in detail in this text.
If you are interested in developing with Jython, I recommend you take a look at this book today. There is also an online open source version of the book that can be found at http://jythonbook.com, but all of it's contents have not yet been updated to include finalized versions of all chapters. I am working on converting the .doc formatted final versions into restructured text at this time, but it is a lengthy process.
Thanks to all of my fellow authors and to the team at Apress for all of their hard work!