Roomorama is not the only one in the person to person travel accomodations game. The company is in a space that’s been well established by other players: CouchSurfing, Vacation Rentals By Owner and, of course, AirBnB. While there's an AirBNB API planned, the only room rental site that is currently public with its platform is the the Roomorama API.
Car companies from Ford and GM to Toyota and BMW, are racing to transform the car into a platform. According to Programmableweb's own Janet Wagner, Ford recently released an API to connect its SYNC AppLink system to developer apps.