Our credit info is online, our home addresses, our banking info, our friends and family photos, what we buy, what we search for, where we go, where we are. What's so risky? :D

The idea is that with your medical records in the cloud, an ER doctor in europe treating the ankle you broke skiing in the Alps would know right off the bat whether you were allergic to any particular meds. It would prevent the need for redundant tests if they had your access to your health data, thus saving money in an industry fraught with wasteful spending. I personally think this is a great idea, and to encapsulate the service in such an elegant and refined user experience is the stuff of startup success.