The FreeBSD 6.3-Release is heading towards it’s End-Of-Life on January 31, 2010. This means the release is no longer supported and maintained by the FreeBSD security team. Users are strongly recommended to upgrade.
Conservative users can upgrade to FreeBSD 6.4-Release (EoL November 30, 2010) or FreeBSD 7.1 (EoL January 31, 2011) which both are extended life releases. Others should upgrade to FreeBSD 7.2-Release or 8.0-Release.
For more information, see FreeBSD.org.