No, it was all on one of my G5 PPC desktops. There were no problems on either the other desktop nor the G4 Powerbook. And, initially, it was Safari 2.whatever and I first tried solving the problem with an upgrade to Safari 3.1.1. That didn't help - same symptoms, one bounce in the dock and eventually computer freeze.
Now, since dumping all those icons at UserName/Library/Safari and everything in UserName/Library/Caches/Metadata/Safari/Bookmarks, Safari 3.1.1 is running faster than I can remember and there are no bounces!