The Rdio Web Service Ruby SDK by Rdio allows API interaction to implement audio and music streaming. Examples show how to authorize user credentials and create playlists from artists. Rdio has been recently acquired by Pandora. For integration updates, follow @Rdio on Twitter.
Google releases new Gmail API to give finer grained control and greater speed, potentially exploding the number of use cases. More on the implications of Netflix closing its API. Plus: check in to your hotel room with your phone, and Android offers a new camera API.