Me wife bought a MacBook to replace her crappy Windows laptop. She's a heavy iTunes user who has downloaded 100+ songs from iTunes and wants to make sure she doesn't lose the songs. I'd like to move all the songs to the Mac iTunes clients, reformat her iPod to Mac, then put all the music, playlists, etc back on her iPod. What's the best way to transfer all her songs to the Mac before formating the iPod?