Java Unit testing framework by Erich Gamma and Kent Beck. Hosted at the Extreme Programming site.
Suns worldwide Java conference.
The Java Financial Object Exchange.
The Source for Java Technology.
A Demonstration of JiniTM Technology and the K Virtual Machine. Or how to interface PalmPilots, Java Technology and Lego Mindstorms.
A good way to get to grips with the Java Language, and the various components.