I agree... the price seems high, the value dubious for emergency purposes (though perhaps not for LT healthcare), and the security both for the patient and for any facility accepting unknown 3rd party memory sticks seems a large mountain to climb. Is there a market for this?

Anyway, for my own EDC/Emergency carry of data, I use this:
1GB] SD/USB card


It's thin enough to store in a wallet or PSK and has a built in USB connector, so it's useful in PocketPCs, Cameras, and Just about any modern computer. There is no easily lost adapter or cap like a USB Memory Keyfob. About the only downside is that it's not something you can attach to your keychain. It *does* however come with a slick little case that protects it and allows just that, but it increases the bulk quite a bit.
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Experience is a hard teacher because she gives the test first, the lesson afterwards.