My initial concern with the Traveler-ER product is the hardware they've chosen to use. It is a fairly common USB drive, unfortunately one that won't securely attach to anything. The key ring attachment on those drives is very flimsy (I broke one after a day or two of key chain carry). This leaves you with having to keep it tucked away in a pocket or somewhere else out-of-site which, I think, would reduce the likelihood of it being found and used in the case of an emergency.

A better solution, at least from the hardware perspective, would seem to be UTAG's ICE products. I would think the wearable options would be the best since they are similar to existing medical products (i.e., Medic Alert).

I can't really talk to well these electronic medical record systems work, but would be somewhat concerned about how portable the data really is (I don't know what kind of machines hospitals & medical clinics would commonly be using).