I DONT BELIEVE IT!!!
Anyway, for those of you who might of bookmarked this page, I've just got the 3c589 3COM network card, AmiTCP3.0b2, and SMBFS to work cross-amiga-PC.
The AmiTCP install guide helped a LOT, and I should note that in order to get SMBFS to recoginse the host names, they need to be entered in the AmiTCP:db/hosts file before they'll work. I know that the SMBFS documentation implies that host names should just work, but with this configuration that just doesn't seem to be the case.
Thanks all,
Hodgkinson.