As the number of online applications increase so do sources of structured data repositories in the form of RSS, ATOM and lightweight Web services. These can all be covered by the larger umbrella of REST-based Web services. Many users want to bring together these discrete data to form new data sets that contain parts of the original services. This activity is referred to as building a mashup. Until now almost all mashups have been built by hand, which requires a great deal of coding. This solution is of course not scalable since more and more sources are coming online. In this document we propose a way to add semantic metadata to REST-based Web services, called SA-REST services, and a way to create semantic mashups, called Smashups, that rely on the annotated services to remove the hand coding of mashups.