Apple released a major release of iTunes on September 12th. Among the major features is hard to find feature that allows you to manage multiple music libraries. After starting iTunes, hold down the option key on the Mac or Alt key in Windows. The Shift key also works in Windows. You will be prompted to ‘Create a new library’ or ‘Choose a library’. The feature comes in handy if you want to sort your music by iPod models or simply create a separate library for iPod synching vs another one that will not be synced to the iPod.