Just thought I'd mention this to those with older HD PCI cards. I'm not sure how this is really new, but apparently Magma has not had a 3 slot expansion for older PCI cards until now.
Note this is not Thunderbolt, but it can connect your PCI cards to either a PCIe card or an Express card. You can then use Sonnet's Express Card to Thunderbolt adapter.
So this could be a solution for those with HD3's with older PCI cards to hook up to newer Imacs or Macbooks with Thunderbolt.
Again, maybe you could have done this before, and I'm not sure how this is different from their other PCI solutions other than being 3 slots.
But I just thought I'd mention it.
http://www.magma.com/3-slot-pci-expansion
http://sonnettech.com/product/echoex...underbolt.html