Together with Red Hat NOC people and other sysadmins I plan to upgrade all of the machines hosted at Red Hat from RHEL3/4 to RHEL5. This excludes svn.gnome.org; but affects basically everything else. See http://live.gnome.org/Sysadmin/Servers for an overview of the servers.
A rough step-by-step guide can be found at http://live.gnome.org/Infrastructure/RHEL5. I am not exactly sure how long this will take. I expect 2 to 3 days. Please mail gnome-infrastructure and cc gnome-sysadmin if you have questions.
Note: This is not final yet. I’ll finalize the schedule this weekend.