TweetSharp is a Twitter API library that greatly simplifies the task of adding Twitter to desktop, web, and mobile applications. Users can build simple widgets, or complex application suites using TweetSharp.
Last month mobile-to-mobile communications company Bump decided to share its technology, which allows for data transfer between two iPhone or Android phones. For example, its flagship iPhone app swaps contact info and photos when two phones "bump" (as in "fist bump") near each other. Bump introduced an API, but to little fanfare.