up2date and up2date-gnome shipped with a non-error producing typo in the /etc/sysconfig/rhn/sources file. (see
https://bugzilla.caosity.org/show_bug.cgi?id=836 )

This has been corrected with these packages:
up2date-4.4.5-1.centos4.4.i386.rpm
up2date-gnome-4.4.5-1.centos4.4.i386.rpm

Use this command to get the update:

yum update