The Last.fm PHP Library by Felix Bruns provides bindings for the Last.fm API. With this PHP Library, developers can get call methods and responses in the form of objects; responses can be cached on the filesystem or in a database.
The Gnip Audience API now features Twitter aggregate user age information. The Gnip Audience API includes nearly one dozen demographic models including gender, interests, TV genre, TV show, language, etc. User age is the newest addition to the set of Gnip Audience API demographic models.
Kasabi has just moved into public beta. The private beta is over, and Kasabi is openly ready and willing to become your data marketplace. This is similar to what the primates over at InfoChimps are doing: building a community around data sets and APIs. The Kasabi API collection feels like a first attempt at standardizing the task of designing an API for accessing a dataset.
Appy Pie, cloud based mobile apps builder, has announced the inclusion of two new music APIs for its Do-it-Yourself mobile application platform. Integration with the SoundCloud and Beatport APIs will allow users to access their music libraries remotely without consuming mobile device memory.