June 26th, 2008 | Published in Google Code
The Google Data APIs have always been built on open standards, and today we're proud to announce that all of the Google Data APIs support OAuth - an open standard for authentication.
You'll now be able to use standard OAuth libraries to write code that authenticates users to any of the Google Data APIs, such as Google Calendar Data API, Blogger Data API, Picasa Web Albums Data API, or Google Contacts Data API. This should reduce the amount of duplicate code that you need to write, and make it easier for you to write applications and tools that work with a variety of services from multiple providers.
See the documentation for the full details on how to use OAuth with the Google Data APIs.
* OAuth also currently works for YouTube accounts that are linked to a Google Account when using the YouTube Data API.