I found 2 devices like you pointed out, I was thinking more of the third way you described. They offer a riser card with 2 slots as an option. What they might have done is what some of the passive backplane systems do which is include extra IDSEL signals in unused PCI pins. How would a card like one with 2 or more NICs on it handle a regular PCI slot? I know there are a few that have 4 seperate DEC chips on them?
GO