I'm trying to get started using the Google Data API for Google Book Search in my Ruby on Rails 3 application, and I don't even understand how to get started. What gems do I need? What do I need to do in order to do something simple like searching for books with a title of Foobar?
Following up on the deprecation issue: I've just published GoogleBooks, a Ruby wrapper that enables users to query for books precisely in the manner described.
It's updated to hook into the present-day Google API, so it's not affected by the recent deprecation of the Google Book Search API.