The benefit of this is that it's, for the most part, machine-independent as long as you use the latest version of the Mac OS X installation DVD.
The Apple System Image Utility (SIU) for Mac OS 10.6.X lets you build a package based bootable OS DMG that has never been booted on a physical machine using the Mac OS X installation DVD. There seems no official way but here I founded something I am going to try out!
I was trying to integrate the update in already downloaded installation so when I install it again, it would install with update.
