As I was trying to learn more about hardening a box I am now the sole admin for I stumbled upon this little gem of a website. The Central Service, which is part of the National Agency (which sounds much more intimidating if just say the NSA) has published a whole bunch or recommendations for specific Operating Systems and how to secure them. In addition there are guides for databases and routers among other things. Who knew the Federal Government could be so useful.
http://www.nsa.gov/ia/guidance/security_configuration_guides/index.shtml