How to add trusted sites via group policy

In the Group Policy Management Editor:

1) Computer Configuration >
2) Policies >
3) Administrative Templates >
4) Windows Components >
5) Internet Explorer > Internet Control Panel > Security Page > Site to Zone Assignment List


Enable it, click Show, add website as value name and 1, 2, 3 or 4 as value.
1. Intranet zone
2. Trusted Sites zone
3. Internet zone
4. Restricted Sites zone

Source: http://social.technet.microsoft.com/Forums/en-US/winserverGP/thread/0baa6428-bf48-4e8a-82e1-b961918090d9