I think Intel just has their hub thing called the "Accelerated Hub Architecture", but I'll have to look.
SiS has MUTIoL, AMD has HyperTransport (which will be used by ALi and nVidia chipsets), and Via has V-Link. Right now we have a standards war, and some of them will eventually bite the dust. AMD has ALi and nVidia going with HyperTransport, and Intel is pretty much gonna keep with their Accelerated Hub Arcitecture. V-Link will be the main competitior to HyperTransport, as I don't think Intel really has much competition for a PCI successor with their Hub Architecture.