I don't think CentOS 6 is out yet, though I'm not sure, can't seem to see it on their website though.
Code:
name=Extra Packages for Enterprise Linux 5 - $basearch - Source
#baseurl=http://download.fedoraproject.org/pub/epel/5/SRPMS
mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-source-5&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL
gpgcheck=1
Well here's my epel repo for CentOS 5, I'd assume you'd just switch the mirror url for the url to the epel 6 repo and put 1 in the enabled section, if it isn't already.