I completely switched my development platform to PowerPC G5 and got curious of whether Java on Mac OS X supports 64-bit mode. The answer is, there's no explicit option for the mode, but certainly some benefit explained at http://developers.sun.com/learning/javaoneonline/2004/javatechdesktop/TS... .
Finally! I have written stuffs about Java on http://www.iasandcb.pe.kr/blog/, but felt that java.net would be a better place to share them. My short bio can tell you roughly who I am, so before posting serious entries, I'd like to introduce myself with a bit more details.