Python and Java technology work together to solve the impossible is the title of an article over on IBM Developerworks. [via Daily Python URL].
Jython is a wonderful tool to have in any test-driven application development plan. The speed with which you can implement new tests, slice and dice exisiting tests, create smart "batch" runs of tests etc. with Jython has to be seen to be believed.
If you are developing tests of Java code in Java. STOP RIGHT NOW! :-) Double your productive day with Jython. (I'm not kidding.).