I have uploaded a new demo. This one is a very quick, very newbie centric introduction to using JUnit in NetBeans 4.1. Enjoy
As an aside: you may notice some negative comments towards NetBeans in the demo, this is because JUnit integration is probably NetBeans poorest feature. Compared to Eclipse, NetBeans hardly integrates JUnit at all. However, it is still there and it is incredibly easy to use. And actually, the wizard that you use to create a test class does beat Eclipse. It is just the final output or reporting that you get from JUnit in NetBeans that sucks. I really miss the little green bar from Eclipse. Also, if you are using your own ant script, it is almost impossible to run a single test class. The limitations of Ant really do require that you run the entire suite of tests and for any real development, this can be a huge problem.
However, with all that said, please, enjoy the demo.