nano /etc/yum.repos.d/CentOS-Base.repo
add the following repos, and it should get more options.
[dries]
name=Extra Fedora rpms dries - $releasever - $basearch
baseurl=http://ftp.belnet.be/packages/dries.ulyssis.org/redhat/el4/en/i386/dries/RPMS
[dag]
name=Dag-RHEL-Yum
baseurl=http://dag.linux.iastate.edu/dag/redhat/el$releasever/en/$basearch/dag
http://www.mirrorservice.org/sites/apt.sw.be/redhat/el$releasever/en/$basearch$
http://mirrors.ircam.fr/pub/dag/redhat/el$releasever/en/$basearch/dag
http://apt.sw.be/redhat/el$releasever/en/$basearch/dag