will it be possible to hook voodoo cards to pcie motherboards with this bridge?
http://guru3d.com/newsitem.php?id=2668

Only if you can find an adapter which can turn that AGP8x into AGP2x.

..but it will (probably) allow you to use a voodoo4 4500AGP in the PCI-E slot

with a SLi mainboard
there will be chance of V4 4500 SLi...
daydreaming...
maybe V5 5500 4X prototype SLi
(with Ati's Approach, seems no need to be supported by hardware to turn on SLi-like technology)

unfortunately ATI's AMR, like Nvidia's SLI, needs an external connection from one card to the other so probably a v5 based SLI will remain a dream