Additionally, by perusing the .bom file, I discovered it also installed a softwareupdate tool in /usr/sbin. This tool lets you run Software Update from the command line, which means you could run it remotely via SSH! This will be very useful for OSX network admins. For the full details:
% man softwareupdate[Editor's note: If you'd like to browse the .bom files yourself, it's quite easy. In the Terminal, just do:
% cd /Library/Recepits/pkgname.pkg/Contents/ResourcesThis will show you everything which has been installed by the given update.]
% ls *.bom ## to find filename
% lsbom name_of_bom.bom | less ## use name from above

