Here is a sample yum.conf file
[main]
srcdir = /mrepo
wwwdir = /mrepo/www
confdir = /etc/mrepo.conf.d
arch = i386
hardlink = yes
shareiso = yes
hardlinkpluscmd = /usr/bin/hardlink++ 2>/dev/null
mailto =
bhutch@gmail.com
smtp-server = localhost
[5Server]
name = Red Hat Enterprise Linux $release Server ($arch)
release = 5
arch = i386
iso = rhel-$release-server-$arch-disc?.iso
metadata = repomd
updates = rhns:///rhel-$arch-server-$release
rpmforge = rsync://apt.sw.be/pub/freshrpms/pub/dag/redhat/el$release/en/$arch/RPMS.dag/
Change mailto
Here's another link with additional repositories:
http://rpm.razorsedge.org/
Here is a link to Dag Wieer's repo, also very popular:
http://dag.linux.iastate.edu/