Quoted: PhpDelicious is a PHP 5 library for accessing the del.icio.us API. It combines data from the main REST and JSON APIs and presents a consolidated interface.

Quoted: BOSS is a new, open platform that offers programmatic access to the entire Yahoo! Search index via an API. BOSS allows developers to take advantage of Yahoo!'s production search infrastructure and technology, combine that with their own unique assets, and create their own search experiences. While search APIs have been available for some time, BOSS removes many of the usage restrictions that have prevented other companies from using them to build innovative new search engines.

Quoted: In a pretty significant move, Reuters is making its news content available to the developer community through the use of a non-commercial API offering, through Reuters Labs. This means that you can now take Reuters news and create applications around it, or better fit the content into your existing applications and sites. The API is available upon request.

Quoted: An open protocol to allow secure API authentication in a simple and standard method from desktop and web applications.