Also can't you add this to the yum.conf lines:
gpgcheck=0 gpgkey=http://rpm.livna.org/RPM-LIVNA-GPG-KEY
That way they don't even have to worry about running that once. Isn't that also right?
You still need "gpgcheck=1", not "gpgcheck=0" I'd have thought. I think this feature only came in with yum 2.1.13, so it won't work with a non-updated FC3 or earlier release.
Paul.