This unofficial library in Ruby language supports the Foursquare Merchant API. It aims to facilitate new campaigns, specials, and venues. Instructions to use Ruby as a gem available as two single lines of code to choose from. Quickstart includes campaigns, specials, and venues. Created by Tim Olshansky.
The most popular video API is about to become more popular. As just announced by Googe's Jim Patterson on the YouTube blog, YouTube Everywhere, the YouTube API has just been upgraded with some very powerful new features.