The G4 just had an
Exception: EXC_BREAKPOINT (0x0006)
Code[0]: 0x00000001Code[1]: 0x968843f0

and noticed also another crash log called JavaNativeCrash_pid526.log

Unexpected Signal : Bus Error occurred at PC=0x9669186C
Function=[Unknown.]
Library=/System/Library/Frameworks/JavaVM.framework/Versions/1.4.1/Libraries/libjvm.dylib

I've put the logs on my public iDisk (stief3 no pw).

Not sure how it happened--I was in the Finder moving a dl from the Shared folder a few minnutes earlier.