The project page for Enterprise Linux GIS (with packages matrix, etc.) is hosted on the OSGeo Wiki : http://wiki.osgeo.org/wiki/Enterprise_Linux_GIS Enterprise Linux
This is the yum repository of the Enterprise Linux GIS effort, which provides RPMs of various GIS applications for Enterpris Linux and derivatives (RHEL, CentOS, Scientific Linux).
You can browse the repositories directly here: http://elgis.argeo.org/repos
To use the testing repository, enable it in /etc/yum.repos.d/argeo-testing.repo
sudo rpm -Uvh http://elgis.argeo.org/repos/6/elgis-release-6-6_0.noarch.rpm
The release RPM can be directly downloaded here: http://elgis.argeo.org/repos/6/elgis-release-6-6_0.noarch.rpm
The GPG public key is available here: http://elgis.argeo.org/RPM-GPG-KEY-ELGIS
sudo rpm -Uvh http://elgis.argeo.org/repos/5/elgis-release-5-5_0.noarch.rpm
The release RPM can be directly downloaded here: http://elgis.argeo.org/repos/5/elgis-release-5-5_0.noarch.rpm
The GPG public key is available here: http://elgis.argeo.org/RPM-GPG-KEY-ELGIS
Note that the EL GIS Plus repository updates the base distribution and is disabled by default.
To enable EL GIS Plus, edit /etc/yum.repos.d/elgis.repo and set enabled=1 in the elgis-plus section.