You can probably find add-on repos like this, but not sure if there is a full replacement YUM repo for the RHN AS4 channel.
I knew up2date is the default but I wanted to use yum, would there be a yum repository for this distribution? or maybe I just missed something??
Registered Linux User # 279330
look for centos 4 yum repos for extra software.
that is the community rhel. See what is available for that.