@AMIGAZ:
The drivers for the card is included with CyberGraphX/Picasso96. I would recommend CyberGraphX over Picasso96 though.
The card connected to the CV64 with the passthrough-cable must as you suspect be a scandoubler/flickerfixer. Very neat solution as the CV64 then switches automatically between its own output and the scandoubler/flickerfixer output.
The CV64 has much better 2D performance than the CV64/3D, but as the name says the CV64/3D has some 3D hardware support which the CV64 lack.
What I meant with the 3D capabilities of the CV64/3D being hyped, I meant that the 3D games available generally does not work with it because they are to complex for its extremely basic feature-set and very limited memory, and if they do work, the result is generally too slow to be usable.
The only game I think works reasonably with this card is the Descent that Hyperion originally released.
If you are intending to play the games listed I would recommend you to get a card with real 3D capabilities, like the CyberVisionPPC or a pci-solution with a Voodoo3-card and preferably a PPC-card.
/Patrik