About a week ago; I posted a proposal over on the CentOS-devel mailing list, the proposal is for a SIG ‘CentOS hardening’, there were a few of the members of the community who are also interested in this. Therefore, I am extending that email to this community; where there is a larger community.
Some things that we will like to achieve are as follows:
disable root (uncomment ‘PermitRootLogin’ and change to no)
disable Gnome user list
Remove reboot, halt poweroff from /etc/security/console.app
Applying security best practises from various compliance perspective, e.g. STIG, SOX, PCI etc… We may also use NSA RHEL 5 secure configuration guide to get some insight or use it as a baseline. The members of the community who are interested in this SIG or are willing to contribute are:
Leam Hall Corey Henderson Jason Pyeron
You can find the post here 
We will really like to get SIG approved by the CentOS board so if anyone is interested or willing to contribute we will be happy to have you onboard.