One of the first things I did on my Media Tempe (dv) was install webmin because I’m a huge fan of easy it let’s you manage your web/server, e.g. web interface to quickly change config files or restart particular services without having to login through SSH.
A more official description:

Webmin is a web-based interface for system administration for Unix. Using any modern web browser, you can setup user accounts, Apache, DNS, file sharing and much more. Webmin removes the need to manually edit Unix configuration files like /etc/passwd, and lets you manage a system from the console or remotely.

Add the following section to /etc/yum.repos.d/CentOS-Base.repo

[dag]
name=Dag RPM Repository for Red Hat Enterprise Linux
baseurl=http://apt.sw.be/redhat/el$releasever/en/$basearch/dag
gpgcheck=1
enabled=1

Install GPG key/signature by running

# rpm –import http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt

Run

# yum install webmin

Your webmin should now be available at
http://your.ip.address:10000/
or
https://your.ip.address:10000/
and you can login using your root account.

I would highly recommend the stressfree theme for webmin, it makes it much easier to navigate. Also, Virtualmin is a must if you manage a lot of domains, it “supports the creation and management of Apache virtual hosts, BIND DNS domains, MySQL databases, and mailboxes and aliases with Sendmail or Postfix”.