Detailed Guidance for a Secure Windows XP
The Information Technology Lab of the U.S. National Institute of Standards and Technology has issued a new draft of a very comprehensive document about securing Windows XP, Draft Guidance for Securing Microsoft Windows XP Systems for IT Professionals document and security templates, version R1.0.2, 147 pages of intense information for IT folks. Unlike the link I posted to the instructions from the SANS Institute, don't give this one to your family and friends.
I'm just starting to wade through this document. There's lots here!