We live in an age when homes don’t have a single computer on a desk, everyone has their own laptop. It’s great that iTunes9 recognizes the need to share files between computers so that everyone in a home can make local copies to hear each other’s music and watch each other’s videos.
Except that we have tiny storage in iPhones, MacBook Air and netbooks — some iPods hold more. We need to solve the problem of keeping only the files we need with us and having the rest stored on the network. I want an automatic system to swap in and out the files on my machines based on my requests and favorites, caching all the most used files locally and pulling less-often used files off the network as needed.