So here’s my problem. My iPhone is associated with my home PC, but I listen to music on two other computers: a Macbook and a Mac Pro. How can I sync music between my iPhone and multiple computers?
In the past I used this approach and a hex editor (PC | Mac) to copy the Library Persistent ID from my main computer to my other computers (if you’re on a PC check out iTunes DB Cloner). This process worked like a charm. I could plug my iPhone into any of my computers and manually manage my music, video, and podcasts.
Then Apple released iTunes 10, and I lost my powers. Luckily, I figured out how to get ‘em back.