Migrations Assistant - Best way to transfer data?
I have a FW800-FW800 cable that comes with an adaptor, and will convert FW800 to FW400.  So I can put on the adaptor and use TDM between a FW800 and FW400 machines.  Macs have ethernet interfaces that do auto MDI-X, so a crossover cable is not necessary.  Plug and play.