Digg API

From their site: The Digg Application Programming Interface (API) has been created to let users and partners interact programmatically with Digg. The API returns Digg data in a form that can be easily integrated into an application or a web site. We intend to make most of the data on Digg.com available through the API. Currently, you can use the API to request very specific information about news stories and videos submitted to Digg, digging activity, comments, and users. The API accepts REST requests and offers several response types: XML, JSON, Javascript, and serialized PHP.