Google Docs, Calendar, Picasa have been doing cloud sync for ages (by tech standards). Apple is just trying to catch up. Music is doing the same thing. I've been using Music for two weeks now and love it. Any music I put in my folder gets picked up and uploaded to my music account automatically. It's sent to the cloud where I can listen to them on any device anytime. I've been playing stuff on my iPad over Safari... it's a little buggy but works. Wish I had an android tablet... Music is almost enough to convince me to switch.