This Ruby SDK works with the YellowAPI. It is a business listings API that allows you to stream Canadian local search content into your applications. It utilizes the database of over 1.5 million business listings and associated rich content allowing users to provide dynamic local business data to customers without the need for their own directory.
OCWSearch, the search engine for OpenCourseWare courses, has launched a search API. With courses from major universities such as MIT, Stanford or Yale, OCWSearch API now lets you search the full index and get information about course title, date, description or names of instructors.
The Google App Engine team has been consistently rolling out a new release every month recently. They have become so consistent in doing so, that new releases probably do not make that much of a splash. However, the team has pleasantly surprised everyone by delivering on one of the most requested features that developers had asked from their PaaS platform: Search. Yes, you read that right.