Well CentOS is officially released. Now the mailing list whining can be stopped … until at least 5.5!
For new installs grab an ISO. For upgrades (which is generally safe), just run:
# yum update
Or if you want to be very careful:
# yum clean all # yum update glibc\* # yum update yum\* rpm\* python\* # yum clean all # yum update # shutdown -r now
Please note that CentOS does not have a perfectly fixed release schedule. It is typically 6-8 weeks after RHEL is released. People wanting updates can follow CentOS (Karanbir Singh) on Twitter.
(As a quick note, yesterday Fedora 12 Beta was released.)