yes currently n-Force-4 chipset motherboards are in market as well with SLi technology.
but I am exclusively waiting for the VIA K8T890 Chipset based boards to be out. as the chipset though is officialy announced and as well is in the process to be embedded into boards, but actual is to see when these boards will hit the shelves.
and VIA K8T890 is PCI-E based chipset. most probably it will be in market right after christmas. (Mobo Manufacturers must be having hard times running for their board to be the first to be in market)