Repairing permissions has taken days - and still going
So that means it's been running for almost 4 straight days, with another couple to go (if the "one day, 18 hour" is to be believed".
If you open Force Quit it tells you the application's not responding, but if you sit there and watch the Disk Repair window you can see it processes a file about once every minute or so.
So far all of the messages have begun with "ACL found but not expected on..."
Mind you, I have two 1 TB hard drives installed, running as a mirror RAID.
G5 Dual 2 GHz, Mac OS X (10.5.2), Plus a 17" MacBook Pro running Leopard, too