Very good news today as Unibrain has released Firenet for OS X.
Firenet is a solution to create a computer to computer network via Firewire. This solution was avalaible for OS 9, but with slow transfer results. The OS X version is supposed to give results as good as a Gigabit Ethernet transfer. You can download a free trial version for OS X, which allows 30 minutes of FireNet functionality per reboot.
I'll post some testing results later today.
Regards.

