Is this really necessary Andy? Apart from having used the Disk Utility to 'repair permissions' and now use Appdelete to remove all the garbage that had been installed by progs I discard, OS10.3 on is meant to do its own clean up and 10.3.9 mostly does.

The only thing I have found is its not a good idea to run NX at the same time as Classic, which I have to do occasionally to use Microstation (3D CAD).

I have bookmarked the MacFixit review of AppleJack in case, but normally I prefer to drink AppleJack.