If you set up a big number of workstations (my pain shreshold woud probably be around 20), or if you have hard requirements that the workstations are really equal in patch level you should maybe consider a Spacewalk server:
https://fedorahosted.org/spacewalk/ http://wiki.centos.org/HowTos/PackageManagement/Spacewalk
I was working with spacewalk a year ago. It went from 0.4 to 0.5, and as far as I was concerned, it is just that: *not* ready for prime time.
I'd go with a cron yum -y update (don't forget the -y), or a cron rsync.
mark