The LinkedIn-API-JSON-Client is a Python library for interacting with the LinkedIn API. The library is designed to allow developers who don't understand either OAuth or the details of the client library to make use of the API.
Free blogging service Posterous is simple to use, but posts several types of content via e-mail or web: video, audio, pictures, and documents. For some users, though, they might prefer more enhancements to the interface, or a mobile app. For them, and the developers that cater to them, there's the newly updated Posterous API. A complete replacement and rewrite to the previous version, this allows a lot more access to developers, including administrative options like adding sites and users.