These guides make recommendations on hardening computers that run Microsoft Windows Server 2003 with Service Pack 1(SP1) in three distinct enterprise environments to achieve maximum security. "Microsoft Windows Server 2003 Security Guide" by Microsoft is considered acceptable by NIST (for non-Top Secret servers).
This guide provide countermeasures for security threats threats against Microsoft Windows operating systems.
These NIST/DOD hardening guides are designed to serve as security checklists to assess IT products' security configurations.
These are some best practice examples and hardening guides for Windows, Mac OS and Linux from other US universities.
Other relevant sources for security checklists.