I've had a couple of people ask me about this over the past week, so rather than answer individually, here's the location for the latest version of the Group Policy Settings Reference spreadsheet.
This spreadsheet lists Group Policy settings described in Administrative Template (.adm) files and Security Settings that shipped with Windows Server 2003 Service Pack 1.
The spreadsheet includes separate worksheets for each of the .adm files and the security policy settings that shipped in Windows XP SP2 , a consolidated worksheet for easy searching, and an Update History worksheet that lists policy settings that have been added since the Windows Server 2003 operating systems were released. Using column filters, you can easily filter the information in the spreadsheet by operating system, component, or machine/user configuration. You can also search for information by using text or keywords