Mark,
You can use the iPod with a FireWire PC card. However, since the FW PC cards do not supply the bus power that built-in FW does, you will not be able to charge the iPod. There is a solution to this issue...buy a FW PC card that has its own little power adapter.
Here is one example that uses a dongle instead of the large, fixed bus port on most new cards. You can shop around for other FireWire PC cards since there is a quite large selection.
http://www.ratocsystems.com/english/products/subpages/cbfw2.html
Also, OSX already has the FW drivers...no software to install.