I created some RPMs for CGMiner on RHEL6(CentOS and Scientific also) for CGMiner that one is compiled for the ButterflyLabs ASIC and one for the USB ASIC Erupter(Icarus).  I have tested both of these as working.  You can grab the RPMS at the below URL.  I can build Fedora RPMS if people are interested.

http://repos.servertoast.com/repos/coins/el/6/