Please check out the following rpm repositories also. Most of them are activated in medley's default configuration (for the distributions supported by the resp. repository).
Vlugnet by Ronny Buchmann<!--<li><a href="http://people.redhat.com/arjanv/2.5/" mce_href="http://people.redhat.com/arjanv/2.5/">kernel 2.6 test rpms</a> by Arjan van de Ven</li>-->
Two interesting (Red Hat Linux based) HEP projects are: