The Hardware Zone looks at the GStor Secure Mobile Storage solution.  While it looks like a normal HDD enclosure, by using the GStor security key, you get 64bit, on-the-fly encryption.  There is a big warning, though the security key slot looks like a Firewire slot, it isn’t!  Plugging a normal firewire cord into it may damage the enclosure, your PC, or both.
“Excelstor’s latest external storage drive is more than just a portable hard drive. The GStor Secure Mobile Storage device comes with hardware-level encryption that secures your data from unauthorized access, so much so that the drive is rendered unusable without the proper authentication.”

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