For Domains with ‘enable pre-release features’ checkbox disabled in the Administrator Control Panel:

The following new feature is intended for release to these domains on February 8:

Desktop notifications for email and chat. These are HTML5 desktop notifications which display pop-ups whenever a chat message or new email arrives.

Note: This functionality is currently only available for people using Google Chrome, but we’re working to make notifications part of the standard Web platform.

Editions included:
Google Apps, Google Apps for Business, Government and Education

Languages included:
All languages supported by Gmail

For more information:
http://mail.google.com/support/bin/answer.py?hl=en&ctx=mail&answer=1075549

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