CentOS Errata and Security Advisory CESA-2010:0817

End Of Life security update for CentOS 3:

As per the upstream vendors errata support policy, updates for CentOS-3
has ended on October 31th 2010.

It is recommended that any system still running CentOS 3 should be
upgraded to a more recent version of CentOS before this date to ensure
continued security and bug fix support.

see also

Thank you to everyone who helped make this project possible.