@stopthegop
*edit* okay, I decided to switch the position of the USB card (I had it in the bottom pci slot) up to the first pci slot (before the Voodoo3000 card). You are correct about the ALi card, now pciinfo shows 4 Acer Labs pci devices "unknown". This wasn't the case with a VIA USB2.0 card I tried (it even correctly identified the Firewire ports on that one). I open up Poseidon and I still get 'unable to open openpci.library' 'OpenUSB.device failed'.
I am now running OS3.9 with BB1&2 on a BlizzardPPC so maybe there are some Mediator variables that I need to change? What are your variables in prefs:env-archive/mediator/? Do you have the spider USB driver installed (I don't)?
Btw, the ALi card I'm using looks similar to the one Chain photographed except mine has a small power connecter to power the USB ports.