Update (July 2012): The sample application demonstrated in this video, Quizzimoto, is now open source.
As a reader of this blog, you already know that YouTube offers APIs, and you probably also know that video is one of the most powerful communication mechanisms for instilling knowledge. Now you can combine the two! In this video tutorial, we'll show you that YouTube and Ruby on Rails are a great fit for building interesting educational apps. Along the way, we'll also cover OAuth2, the various client libraries for Ruby, and using test-driven development with RESTful web APIs.
—Shannon -jj Behrens, YouTube API Team