The weird thing is, his card seems to be based on the same chipset as mine, but mine works and his doesn't. I have a DLink 530TX+ which uses the Realtek 8139 Chipset, and so does his (at least that's what the win2k drivers said).
My guess is that the rtl8139 drivers in BeOS don't recoginize his cards PNP codes (or whatever they are) and thus doesn't load the correct drivers. Is there any way to "add" those codes to the driver included with BeOS to make it work? 🙂