Anything USB/FireWire that is OHCI or EHCI compliant will work in OS 9 and X.

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That is not what I found when my sister got an apparently OHCI compliant VIA based USB 2.0 card. It has since been returned though so I can't get any more details. Perhaps we should change that from "will work" to "should work"?

Other cards that don't require boot-time operation (Ethernet, capture cards, specialized accelerators, what have you) can generally work in both PCs and Macs provided that drivers for the operating system exist.

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Reminds me of the MPX EN5038A1 based 10/100 Base-T card that my Sawtooth could see as an ethernet card but not actually use. :\
Might go poking around the local PC shops for cards to test sometime.