Apple is distributing a beta build of Mac OS X 10.5.3, a major update to its Leopard OS, around developers for testing with chatter claiming release in two to three weeks.

A report on AppleInsider indicates a hefty update, with over 170 patches for constituent elements of the OS, including a patch for AirPort problems experienced by some Macs when rejoining an AirPort network after sleep.

The report also suggests fixes for CD or DVD sharing and System crashes, with patches for Active Directory, Back To My Mac, Mail, Spaces, and other system elements undergoing strict testing.