Besides offering the latest Mac OS X 10.5.1 update with all CPUs, Apple is now shipping the latest update of Mac OS X 10.5.1 incorporated into its retail Leopard Mac OS X installation disks. Previously, purchasers of Leopard required an over-the-internet Software Update to bring their Mac OS X 10.5.0 installation up to the latest version (10.5.1). Apple notified retailers of the change on Friday.
Leopard on October 26th 2007 but quickly released
the Mac OS X 10.5.1 update on November 15th, 2007. The 10.5.1 addressed a number of stability and compatibility issues with the original 10.5.0 installs.