Activewin.com points to a couple of new security papers in the download center:
Windows Server 2003 Security Guide
The Windows Server 2003 Security Guide provides guidance to assist in hardening Domain Controllers, Infrastructure servers, File servers, Print servers, IIS servers, IAS servers.Certificate Services, and bastion hosts.
Threats and Countermeasures: Security Settings in Windows Server 2003 and Windows XP
The Threats and Countermeasures Guide contains detailed information about relevant security settings that can be configured on Microsoft Windows Server 2003 and Windows XP.