The old stable release Debian GNU/Linux (codename 'woody') has been archived. The official source for this distribution is the dedicated archive host called archive.debian.org. It is no longer available on regular Debian mirror servers.
After four and a half years this marks the final end of life for GNU/Linux 3.0. This distribution has been superseded by Debian GNU/Linux 3.1 (codename 'sarge') which the Debian project has released on June 6th, 2005. Security support for woody has therefore ended already in June 2006, one year after the release of sarge.
The Debian security team is able to support up to two distributions at the same time for about one year. This way users are given a one year period to upgrade their systems to the current stable distribution. After this period security support for the old stable distribution is discontinued and the distribution itself is archived on the dedicated archive host.