The Red Hat Network (RHN) and RHN Satellites are part of my daily grind. They have not always been the easiest to work with when deploying RHEL to a large university with many business, research, and education use cases.
Finally, Red Hat is shipping a tool to help clone RHN channels at a specific point in time and get them right. Pinpointing server to a specific patch set is not my preferred method of maintaining systems, but a lot of people depend on working in that manner. This tool goes a long way to making that possible.