from IDT and PLX - some PCIe switch chips with a prospect of multi-root architectures. Maybe pre-IOV, but the docs attached give a thorough technical background, answer many of my basic questions.

http://www.idt.com/products/getDoc.cfm?docID=18639469

http://www.idt.com/products/getDoc.cfm?docID=18688297

http://www.plxtech.com/products/expresslane/switches.asp

Interestingly for me, Pericom has not much to offer in that vein... Unsurprisingly, neither has Intel. That LSI paper on IOV mentioned before makes me wonder what LSI has up its sleeve.