Just because you share a Mac at home doesn't mean you want to share an iTunes library. Maybe you and your significant other don't have the same taste in music, TV, or movies. Maybe you want to keep all the kids' stuff out of your carefully curated classics. Sure, you can create different logins for your Mac, but if all you want is separate iTunes libraries, it's easy to do, and easy to switch between them any time you want. Here's how!
Full story from the iMore Blog...