Have a look at JXTA public network
By slowhog on May 28, 2008
JXTA NetMap is a project helps to visualize JXTA network, we actually use this project to run the public rendezvous. Those public RDVs and relays assemble the JXTA public network serve as a playground/testbed so that people can test their JXTA applications without deploying a infrastructure. However, you should never use it for production, since those node can be down at any time without notice. Even for testing purpose, you are advised to use the public network to bootstrap your own peergroup.
The project has been packaged as a self-contained jar, which you can download and start it by 'java -jar jarfile', but the jar had not been updated for a while, meaning JXTA platform embedded is not up to date.
Seeing the cool "Next-Generation Java Plug-In" feature in Java 6 Update 10, I think it would be cool to make it an applet so that user can experience it and deploy it easily. Before I get to that point, I spent some time to JNLPlize it and make the project part of JXTA nightly build.
You can launch the applicaiton, seeing live is better than a screenshot IMHO. :-)