So I was just reminded by Mike James about this tip on running Classic from a disk image on OS X that I'd previously found via Mark Pilgrim. I think I need to try this the next time I feel like wiping and reinstalling my iBook. I've been meaning to try a different file system under OS X - like, you know, one that's case-sensitive so that something like /usr/bin/HEAD doesn't overwrite /usr/bin/head. That, and I just don't have very much use for Classic anyway, other than for 2 or 3 apps.