This video shows us the method to transfer files between iTunes libraries in iTunes 9. First step involves downloading iTunes 9 from apple.com. Go to the 'Edit' tab and 'Preferences'. Go to the 'Sharing' tab and select the 'Share selected playlists'. Select the playlists you want to share and click 'OK'. Now go to 'Advanced' and select 'Turn on home sharing'. Make sure that both are under the same account. Type in the password and you will see an icon in the shape of a home in the left side. Click on that and it will open the files for sharing. Now you can copy and paste or drag and drop the files for sharing.