Right now we are only working with three partners, all of whom we have a personal relationship with and trust 100%. That said, if/when we expand, we won't have the luxury of only working with people we know and that's going to make the due-diligence process more difficult. But unlike other NGO's (like global giving, kiva, etc.) we don't need a ton of partners to grow. A single partnership with an organization like Doctors Without Borders would ensure we have enough profiles for a lifetime.
However, I love the idea of having the community regulate the Medical Partner via SMS or something like that (sort of like an, "am I driving poorly? call 1-800... for healthcare providers). Great idea!