Here is a great new Jython article by Barry Feigenbaum over on IBM's developerWorks. Check it out.
alt.lang.jre: Get to know Jython Get to know Jython, in this first article in our new series introducing alternate languages for the Java Runtime Environment, "alt.lang.jre". Jython is an implementation of the popular scripting language Python, but running on a JVM. For Python developers Jython is the best possible entry point to the Java platform; for Java developers it may be the strongest incentive to learn another language. Frequent developerWorks contributor and alternate language enthusiast Barry Feigenbaum introduces Jython and shows you what it can do to enhance your productivity on the Java platform.