This page describes how to create a colored map using the Charts API.

OpenCV (Open Source Computer Vision) is a library of programming functions for real time computer vision. Uses range from interactive art, to mine inspection, stitching maps on the web on through advanced robotics.

Bueda increases the value of rich media and user-generated content via its innovative semantic analysis engine. Leveraging research from Carnegie Mellon University’s Language Technologies Institute, Bueda combines user-generated tags, existing ontologies, and semantic analysis in order to provide publishers with actionable information that can be used for content categorization, targeted advertising, content recommendation and search engine optimization. Via Bueda’s API, any user generated content website can have access to the latest technology for tag disambiguation and cleanup with minimal integration hurdles.

The Social Graph API makes information about the public connections between people on the Web, expressed by XFN and FOAF markup and other publicly declared connections, easily available and useful for developer.

By wrapping and extending the Flash sound API, SoundManager 2 brings solid audio functionality to Javascript. This is the API that is used by soundcloud

This website contains all the information you need to build extensions for Google Chrome

Article describing some aspects of building REST API.

Seems like a great little Twitter API library for PHP (using with CodeIgniter)