Fingerprint-protected USB "disk"

I was following a link about keeping MacOS X keychains on external USB devices (flash drives, mostly) and found a pointer to the BioSlimDisk, a fingerprint-based encrypted USB storage device.

It's not cheap ($150 at DevDepot), but it is an interesting approach, since the fingerprint is used to encrypt/decrypt all data, but can't be sent (directly) to the OS.