TwitterAuth: For Near-Instant Twitter Apps - Intridea Development Blog
http://intridea.com/2009/3/23/twitter-auth-for-near-instant-twitter-apps

Neat gem that uses Twitter as the login authentication for your app. Interesting idea and makes it one less thing to worry about when building a secured app.

TwitterAuth is a Rails plugin that provides a full external authentication stack for Rails applications utilizing Twitter.

やり方、やりかた

■ <Message>The request must contain the parameter Signature.</Message>

000&ItemId=0679722769&Opera

Amazon APIを使うための情報