Ok, so we all know that (if selected) your iPod will automatically Sync with your iTunes library, so that in effect your iPod becomes a replica of all the music files in your iTunes library. What I'm wondering is, is there a way to do the opposite? i.e. to Sync an iTunes library with your iPod, so that iTunes becomes a replica of all the music files on your iPod? The reason I ask is, I have two different computers. The one comp (PC) has all my music, and I use this to Sync my iPod, but then I'd like to be able to use my iPod to transfer/Sync these files to the OTHER computer (Mac). See what I mean? The Sync feature is so convenient, so I'd rather the iPod just sync automatically to the other comp (Mac) (i.e. transfer newly added files, or delete files, etc.), rather than me having to manually add/transfer new music to the other comp (Mac) all the time. So again, is it possible to auto-sync/transfer iPod files to iTunes, rather than (the normal way) of the other way around?