There are a number of update documents and tools for Group Policy suited for Windows 2008 and Windows Vista. Here is a compiled listing for configuring Group Policy settings for these (and prior versions) of the Windows Operating System.
Templates
Administrative Templates for Windows Server 2008 (admx files)
Windows Vista Starter Group Policy Objects
Tools
Remote Server Administration Tool - Windows Vista 64-Bit
Remote Server Administration Tool - Windows Vista 32-Bit
Documentation
Windows Vista Security Guide
A Guide to Group Policy Preferences for Users of PolicyMaker Standard Edition
Group Policy Preferences Overview
Group Policy Settings Reference for Windows Server 2008 and Windows Vista SP1
Information about new Group Policy preferences in Windows Server 2008 - KB 943729
Group Policy Documentation Survival Guide
Lynn LunikIndependent Security ConsultantWindows(R) PlatformIT Pro Secure Corporationandexchangesummit.nethttp://itprosecure.com and http://www.exchangesummit.net blog <at> itprosecure.com