I quite like Rick Hightower's "Python Programming with the Java class libraries" but a lot depends on what you want to do with Jython. Just as I couldn't recommend "the best" Java book, it's hard to recommend "the best" Jython book. Any more details on what you want to do?
I guess you are familiar with Java. If so, this is a nice book: Jython for Java Programmers. Anyway, my suggestion is to get a good python basis before learning jython, this is a really useful book for it:Python in a nutshell HTH [ September 10, 2003: Message edited by: Juanjo Bazan ]