Ethernet is ideal if at all possible, and it happens to be possible on almost every 68K Mac. As Sun once said, "the network is the computer." If you don't have a varied enough Mac selection (or the requisite Thursby software) to do direct file sharing with an OS X machine, run netatalk on a Linux or BSD box (or VM). It's 2012 now and there is definitely no reason for people to be doing sneakernet anymore.