I have been told that the SIIG USB/Firewire/Gb Enet card will work in the PCI Mac using the RealTek drivers for the 10/100/1000 ethernet. The fellow was actually writing about a generic version of the card which was briefly available from the factory which made the SIIG cards, but they're identical (except the price, $80 vs. $15).

Strangely, from what I understand the USB/FW/10/100 card does not work well in Macs.

If you need 10/100 Nubus cards email me and maybe we can work out a deal. I have some AsanteFast 10/100 NuBus cards still in boxes. They're refurbs. trag@io.com