The SoundCloud PHP Library by Nelson J Morais offers the features of user authorization, user authentication, user credentials, flow authentication, access to GET, PUT, POST and DELETE references and download & upload media files. Requires PHP 5.3+
Remember newspapers? With Yahoo Entertainment's iPad app, you might not need to for very much longer. You'll find the lifestyle section (Dear Abby? It's got that) and more in the mashup that stretches across several Yahoo teams. And the way it was put together may offer a glimpse into the future of APIs and preparing content for multiple devices.
Online seller Amazon has a whole suite of Amazon APIs that are focused not on its books and other products, but instead on letting developers use Amazon infrastructure. These Amazon Web Services (AWS), as they're called, provide cloud-based computing and storage services like Amazon EC2 and Amazon S3. Amazon's annual contest recently opened up to the entire world. The top winner will receive $50,000 in cash and $50,000 in AWS service credits.