LOGICAT Originally, I was going to write a comment that /usr/sbin/softwareupdate has been available in Mac OS X since 10.2.x. The description above is a bit terse, and on first read I couldn't understand why you were offering something that's already present in the OS.
Here's the move verbose description from the developer's web page, which gave me my eureka moment: "A packagemaker script (installer) used for forcing macs to install all available Software Updates from Apple in Mac OS X (Tiger) in conjunction with NetBoot/ARD to run command on multiple macs remotely"
(Version 2.0)