Check this out. Engadget just reported that a company called Magma is working on a thunderbolt device that will have 3 PCI-e slots. Just think of the stuff you can do on your MBA.
http://www.engadget.com/2011/09/07/magma-expressbox-3t-gives-you-3-external-pcie-slots-over-thunder/
http://www.engadget.com/2011/09/07/magma-expressbox-3t-gives-you-3-external-pcie-slots-over-thunder/
