Our API directory now includes 116 retail APIs. The newest is the Leaf API. The most popular, in terms of mashups, is the Shopping.com API. We list 60 Shopping.com mashups. Below you'll find some more stats from the directory, including the entire list of retail APIs.
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.