Google Apps Customers now have the ability to sync their Google Contacts using CardDAV. CardDAV is an open protocol for contacts that enables 3rd party clients, like the iOS contacts app, to sync Google contacts.

Editions included:
Google Apps for Business, Government and Education

For more information:
http://gmailblog.blogspot.com/2012/09/a-new-way-to-sync-google-contacts.html
http://support.google.com/mail/bin/answer.py?hl=en&answer=2753077

whatsnew.googleapps.com
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