Jetway somehow thought that they should throw in another PCIe slot just for goo measure, not that nVidia has support for Tri-SLI yet but you never know right? Either way it's super cheap, for a SLI board let alone one with 3 PCIe slots. I don't know about the quality of Jetway's boards and I don't doubt that it's a little flacky but hey if you want bragging rights this should impress.3 slots!
Hey, me too, though maybe not to the same extent. I know there are things like raid controllers that fit into PCI-X slots but that's pretty much only server board and Apple territory right there, as for PCIe, nothing that I've heard of but you'd think that something would come along.