I've always had iPods with greater capacity than my iTunes library. I've never given a second thought to syncing. Now, I'm interested in either the new Nano or Touch, which will have less capacity than my library. How does syncing work? Will iTunes automatically fill the iPod with my most played songs? Will I have to manually tell iTunes which playlists to sync? Can I still browse by album, even if the whole album isn't on the iPod? I'm just a little lost on how syncing works with a smaller iPod than the library.