While poking around my OS X system folder, I found the following files:
HD:System:Library:Extensions:UltraTek33.kext
HD:System:Library:Extensions:UltraTek66.kext
HD:System:Library:Extensions:UltraTek100.kext
OS X currently does not support the UltraTek ATA card. I've contacted SmartDisk (VST) and they've indicated that they will not support the card under X. Does the existance of these extensions suggest that Apple might support the UltraTek card under X even though SmartDisk has said they won't support the card?
At this point, the lack of OS X support for this card is the only thing keeping me from going to X full-time.