AuthSub is an authentication proxy service bundled with the Google Data APIs, which lets users gives 3rd party applications secure access to their Google Apps service data without having to trust those applications with their usernames and passwords.

Editions impacted:
Standard, Premier, Education, Team and Partner Editions

Languages impacted:
All

How to access what's new:
If you're a developer, visit the AuthSub documentation page to learn more about enabling AuthSub for your web applications. (see link below)

For more information:
http://code.google.com/apis/accounts/docs/AuthForWebApps.html