CentOS hasĀ announcedĀ the release of version 5.6.
Updates include:

  • ext4 is now a fully supported file system
  • libvirt was updated to 0.8.2
  • bind was updated to 9.7 and supports NSEC3 now.
  • ebtables was added
  • php53 is available as a php replacement.
  • System Security Services Daemon (SSSD) has been added.

 
Announcement: http://lists.centos.org/pipermail/centos-announce/2011-April/017282.html
Release notes: http://wiki.centos.org/Manuals/ReleaseNotes/CentOS5.6