Released on November 13, 2001, on the same day that AirPort Software 2.0 was made available for download, Mac OS X version 10.1.1 was the first update to Mac OS X 10.1 "Puma". The build number was 5M28, although this was 5M45 for PowerBooks that shipped with the new OS.
What's New in Mac OS X 10.1.1
The update includes improvements for many USB and FireWire devices; this includes support for more digital cameras, as well as overall enhancements to CD and DVD burning.
Enhancements are also present, network-wise. AFP, SMB and WebDAV networking have been improved. Also, printing received improved support.