The Windows Server System Reference Architecture Website is a very powerful resource providing you with detailed best practice design for you Device Services, Core Services, Security Services and Supplementary Services of your IT Infrastructure.

As an example here's what you have under Security Services:

Firewall Services
Introduction | Blueprint | Planning Guide | Build Guide | Operations Guide

Backup and Recovery Services
Introduction | Blueprint | Planning Guide | Build Guide | Operations Guide

Certificate Services
Introduction | Blueprint | Planning Guide | Build Guide | Operations Guide