http://www.itechster.com In this tutorial we will go over on how to create multiple itune libraries on Mac OS X, using the Option-Shift Command. This can also be done using a shareware program from Dougs Apple Scripts. This video was inspired by iTunesiHelp whom has done a version for Windows XP/Vista.
http://dougscripts.com/itunes/itinfo/ituneslibrarymanager.php
Have Fun & Enjoy.