Today in 2012? I have a hard time seeing how to use
anything except CF as
an interface standard that will exist going ahead for at least a decade
maybe two in wide usage. The other format to choose is a USB keychain
drive. If like me you think the CF format is just too physically tiny,
epoxy a CF device to an old Lilith D120 style cart and have it slide into
a reader that you've milled into the original D120 or D140 slot :-)
Why not the SD card? Cheaper, smaller and easy to interface! :)