[CentOS] looking for cool, post-install things to do on a centos 5.5 system

From: Robert P. J. Day <rpjday at crashcourse.ca>

>   so, any recommendations for neat things  that people here have done
> in the way of what can be added to or configured  on a centos server
> system?  the course covers all the standard topics --  installation,
> package management, service management, filesystem maintenance,  that
> sort of thing.  so i'm looking for bonus, neat stuff that others  here
> do as a matter of course when putting together a centos  system.

Random thoughts (maybe already in your standard topics):
- kickstart (cd, usb, pxe)
- local CentOS repository
- drbd or some distributed fs
- nfs / nis
- ldap
- samba
- keepalived / ipvs
- fail2ban
- proxies (squid, nginx...)
- monitoring (nagios, cacti...)
- VM (KVM, Xen...)
- quotas, acls
- encrypted fs

JD