Drawer is an app that helps you keep track of places that people recommend, as well as put together lists of your favorites to share with friends and family.
There is also a pro version of the app for travel-related industries, that allows folks like hotel concierges, travel agents and vacation rental owners quickly put together personalized lists of recommendations that are hosted as single page websites, fully branded, that can be sent to customers.
Unlike review sites like Yelp or Urbanspoon, and unlike social travel apps like Foursquare, Drawer is focused on connecting tight groups of people and allowing them to easily exchange recommendations back and forth.
Also, whereas most sites and apps like this focus on a *place*, and what people think about that place, Drawer focuses on a person, and what places that person likes/recommends. It basically turns the Yelp model upside down.