The Benchmark Email Java SDK by Benchmark is available for download on the page provided. It allows to communicate with the API to implement email campaigns, events, and marketing features into applications. Developers can work with most of the API methods available on the documentation.
RESTful services that underpin many Web APIs today should follow design patterns that make any Web API a good Web API. Such design patterns are all about respecting HTTP protocol specifications, respecting good URI design principles, or taking the full advantage of underlying Web infrastructure for Web API's good performance and scalability. If you are interested in such practices or in a cutting-edge research that may impact the future of Web APIs developments, you should look into the series of workshops on RESTful Design.
Coming soon are three noteworthy O'Reilly conferences that should be of interest to API and mashup developers, and thanks to their sponsorship, ProgrammableWeb has a pair of free tickets to their Graphing Social Patterns East next month as well as discounts for all three events.