Jython Books
1."Jython Essentials." Samuele Pedroni, Noel Rappin. O'Reilly and Associates. 2002.
2."Jython for Java Programmers." Robert Bill. New Riders. 2001.
3."Python Programming with the Java Class Libraries: A Tutorial for Building Web and Enterprise Applications." Richard Hightower. Addison-Wesley Publishing. 2002.
Books 2 and 3 are available from Safari.
For a detailed list of books and articles look at:
[http://www.pycs.net/users/0000177/ Ed Taekama] has compiled a fine list: [http://www.pycs.net/users/0000177/stories/13.html Jython Bibliography]