I tend to make good use of RPMforge for my production CentOS systems. I have local repos for the main CentOS distribution and updates, however, recent kickstart installs are starting to hang on downloads from slow RPMforge mirrors. I've tried limiting to specific RPMforge mirrors and also using the yum fastestmirror plugin.
I'm currently attempting to establish a vpn connection, but I am unable to install a vpn client. I assumed installation would be as simple as sudo yum install vpnc, but CentOS is unable to find the vpnc package.
I browsed some more, and discovered I needed to install and enable the rpmforge repository for yum to find the package.