Procedure:

* Install stock Redhat 7.0
* Disable the starting of rhnsd in runlevel 3. (by removing the symlink in 
  the rc3.d directory
* Run up2date, and update packages.

- The disabled service is now run once more. (the symlink reappear)

This is /bad/. If I turn off a daemon, it is because I do not want it to
run. Having an update program automatically turning it back on means I'm
likely to run services I thougth I had shut off. And consequently may well
neglect to upgrade in the future, thinking that "I don't run that service
anyway".

And yes, I know this does not happen if I rpm -e the package, instead of
merely disabling it in a runlevel. But many services I need now and then,
but not daily. Besides, rpm-e means I'll have to download it ower should I
wish to use it afterall.