If you’ve pulled down the latest J2SE 5.0 Release 3 via Software Update on Mac OS X Tiger, execute the following command in the Terminal:
$ lipo -info /System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/Commands/java
If you do this you’ll see the following output:
Architectures in the fat file: /System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/Commands/java are: i386 ppc
A bit of translation: Apple’s latest update to Java is a Universal Binary. Interesting, no?