Betfair Python Sample Code by Betfair demonstrates a basic use case of placing a bet on the next GB Horse Racing market. A comprehensive description of the samples can be found in the developer samples documentation. This sample code is written in Python, and is related to the Betfair APIs.
Here is an interview with Scott Gimpel Founder and CEO of FantasyData.com. The site used to be known as NFLdata.com and provides NFL statistics. The site claims to have almost 25 million API calls /month during football season with over 300 developers working with it's API.
Mind42, a mind mapping web application, has launched the Mind42 API. Mind mapping is a process that collects ideas and then arranges them in a graphical way. The tree or star-like graphical depiction that Mind42 creates illustrates the connection between different ideas or topics. The Mind42 API allows developers to access, create and edit maps on Mind42 from third-party applications.