yo!
yeah you can get PCMCIA to PCI adapters (not sure about PCI Express though)
Also seen PCMCIA to USB adapters too :)
http://www.elandigitalsystems.com/adapter/p111.php
http://www.elandigitalsystems.com/usb/u111.php
http://www.pci-to-pcmcia.com/pci_to_pcmcia.php?lang=
hope this helps :)