The Mendeley Ruby sample code by Mendeley, demonstrates how to perform a search for a catalog document using an identifier type, according to Mendeley Stack. Resources available on GitHub include sample code and the sample app that consumes the API.
GoodGuide is a service that we have been using as a family for a while. It attempts to analyze a product holistically & scientifically to produce a simple 1 to 10 rating of its "goodness." I am personally satisfied to see that the GoodGuide API will share this data with the world.
Web APIs and mashups are not only of interest to the developer community. There are also research activities that look at how to improve various aspects of API design as well as services' and mashups' implementation and deployment. If you are interested in a cutting-edge research that may influence the future of Web APIs, then you should look at series of workshops on Web APIs and Service Mashups.
Merriam-Webster, the household name in dictionaries, launched the Merriam-Webster Dictionary API last week. The most trusted name in dictionary/thesaurus references has decided to make its resources available to developers through the new API. Merriam-Webster is making eight different resources available via the API.