jeffs: Have you looked at GNU Classpath, Kaffe or gcj (part of gcc, but I don't know it's URL)? Those are the primary free software java projects that I know of, and I'm sure any one of them could use some help :)
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!