Thanks, but FWIW I picked up an
IrisCard 4. It doesn't have all the extra functionality on a Mac as it does on a PC, but it scans the cards, give you an image you can save and lets you export the contact file as a vCard. Then, you just double-click the vCard to put the contact in your Mac Address Book.
The instructions suggest that you can export "direct" to a Mac Address Book, but I haven't figured out how to do that yet.