The eBay API SDK for Perl by Tim Keefer aims to simplify the programmatic interface into the eBay APIs. SDK classes include Trading API to authenticate access, Finding API to obtain eBay's next search options, Shopping API to access public eBay data, and Merchandising API to search available items on eBay considered popular among buyers. To configure the SDK information related to YAML and eBay credentials are available.
Yammer, a microblogging-for-business site and winner of the top prize at the recent TechCrunch50 conference, has released an API to allow developers to build their own applications around the service (Yammer API profile). Created by the people behind genealogy site Geni, Yammer has taken the tried and tested Twitter model, which asks users to answer the question "What are you doing?" in 140 characters or less, and adapted it for businesses, turning the question into "What are you working on?"