The WordPress.com Node.js SDK by Scott González allows developers to integrate the WordPress.com API into their Node.js applications. This SDK requires WordPress 3.4+.
LinkedIn has just announced that updates have been made to the LinkedIn Developer Platform to make it even easier for the development community to "use LinkedIn as their main distribution platform for discussing and sharing professional content." One of the key ways sharing professional content will be expanded is via the upgraded Share Linkedin API.
Qucit offers predictive bikeshare availability API for the town of Bordeaux. SAP HANA launches API and other cloud tools. LinguaSys launches natural language API portal.
In a promising sign for the future of data portability across platforms, earlier today DataPortability.org Workgroup announced that Google, Facebook, and Plaxo joined their initative.