Google Apps now offers an OpenID API that allows end users to securely sign in to OpenID-enabled third party web sites using their Google Apps user account.

Editions included:
Premier and Education Editions

Languages included:
All supported languages

How to access what's new:
To learn more about Google OpenID Federated Login API, click here

For more information:
http://googlecode.blogspot.com/2009/07/google-apps-openid-identity-hub-for.html

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