In music libraries significantly larger than available storage capacity on portable music devices, would it make sense to mark certain music as "Sync to MusicDevice xx" ?
I have one iPod 30GB and one iPod Nano, and there are some albums I always wish to carry with me. As an added comfort to users, how about optionally adding a custom ID3 tag that identifies the track as "mandatory" for a certain iPod?
I know there are playlists, but these are much more difficult to maintain in their current form when they are to keep track of multiple hundreds of songs

-Y1