Create Mountain Lion Install Package

Download the createOSXinstallPkg tools from here: http://code.google.com/p/munki/downloads/list
Unzip the tools, and make sure you have a copy of the Lion or Mountain Lion installation apps.
Run the following command to create a package in the same directory as the tools:
sudo ./createOSXinstallPkg –source /pathto/Install Mac OS X.app
dd