http://66.93.133.223:8080/pitch/index.html
Technically, this game isn’t 100% Java, but the guts of it are. It’s pretty amateur-looking, but it works, and I think it’s the only place you can find this card game online (it has a big following in certain parts of the US).
The server is 100% Java, running on a Linux box behind my DSL connection. The client consists of an applet which handles communication with the server, and a DHTML user interface (which currently only works in IE). The applet and DHTML (JavaScript) communicate via LiveConnect.
If anyone feels like contributing, I would think about opening up the source and creating a project on sourceforge. Ideally, I’d like to replace the DHTML user interface with an AWT one. And there are plenty of other areas for improvement.