The Star Wars Android SDK by Julien Salvi interacts with the API to unofficially access people, films, species, starships, vehicles, and planets. It demonstrates usage by creating a global instance in the application.
One of the bigger challenges with anything having to do with software-as-a-service (SaaS) applications is how quickly they can sprawl out of control. Before most organizations realize it they wind up with multiple silos of SaaS applications that are even more difficult to integrate than traditional enterprise applications.
Does your business use Excel spreadsheets to sort, organize, and make sense of data? Would the data generated by those spreadsheets be useful to partners, customers, or other departments within your organization? Datownia, a recent product from Release Mobile, generates an API from an Excel spreadsheet that allows developers to integrate their data with any website or app.