I have to admit, I've NEVER had Limeware crash, or lock up, on my G4 running OS X. Then again, I've never had OS X crash either. Limeware runs a little on the sluggish side, but then it's slow on my P3-933 too.

btw, Mac OS X does use a real Java implementation.. Microsoft is the only one that uses a hacked version of Sun's standard.

I haven't tried the OS 9 version though, so I can rightly comment on it.