The Xero Ruby Library xeroizer provides developers a way to communicate their ruby/rails based applications with the Xero API. There's information on development for both public and private applications.
Eko has recently launched Domestic Money Remittance Service through API integration in partnership with 10 plus companies in mobile recharge, travel & ticketing domain. Some of the various partner companies include UFX, The Services Online, and Yahya Technologies.
The U.S. housing market is still in rough shape. Now there's an API for your applications to see just how bad things are. Using the Foreclosure Listings API, you can search for homes and get details of a foreclosed home (details at our Foreclosure Listings API profile).
What do online retailing and selling web infrastructure services have in common? It's a good question and one that Om Malik posed to Amazon CEO Jeff Bezos at last week's D6 Conference in this very good, impromptu video interview.