Nov 15 2007
The Support Document for the Mac OS X 10.5.1 Update is pretty tight lipped, saying only,…
The 10.5.1 Update is recommended for all users running Mac OS X Leopard and includes general operating system fixes that enhance the stability, compatibility and security of your Mac.
The Update’s information page is a bit more forthcoming with information and explains updates to things such as AirPort, Back to My Mac, Disk utilities, iCal, Mail, Networking, Printing, Security, Firewall, System and Finder, and Time Machine.
Possibly the most notable update reads,
Addresses a potential data loss issue when moving files across partitions in the Finder.
This sounds like the issue Tom Karpik wrote about in his blog a few weeks ago.