Update: A newer version of this article is available at http://www.centosblog.com/2012/01/16/how-to-install-webmin-on-centos/
Earlier, I posted a how-to to Install Webmin on Ubuntu, now im going through the tutorial again but this time for CentOS.
Install dependancies before we proceed to install webmin
yum -y install perl-Net-SSLeay
Download the latest version of webmin
wget http://downloads.sourceforge.net/project/webadmin/webmin/1.500/webmin-1.500-1.noarch.rpm?use_mirror=ignum
Once it is downloaded, install the RPM using the following command
rpm -i webmin-1.500-1.noarch.rpm
No more steps required. Its installed 
Go to your browser and access the control panel with valid ssh credentials
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