eBay4R is a Ruby wrapper for eBay's Web Services SOAP API. Has ease of use and small footprint. Instead of 40-50 line examples eBay gives you in C# and Java, with Ruby and eBay4R, examples are 5 lines or less.
Take a look at our API directory and you will quickly note that the Google Maps API continues to reign as the most popular API used for mashups. As the API continues to gain momentum, several new utilities have emerged to improve the user experience (or UX as it has come to be known).
Just months ago, Chirpify was known as the company that "turns tweets into transactions." Chirpify has now deemed such commerce "in-stream commerce" and CEO (Chris Teso) has an interesting outlook on the industry that he feels Chirpify leads.