By popular request (2 of them) here are my additions to the default repositories in yum:
Does the order matter?
I hesitate to install from a 3rd party blindly, and use separate config files for each 3rd party repository, even Rawhide. For example, if I want to install from dag, I use yum-dag.conf. My base yum.conf includes only the base and update groups, with base coming from a loopback mount of the iso images and update including a bunch of mirrors.