Well, batch renaming would be pointless for songs since every song has a different title and artist. Though if you COULD make artist/song title/album corrections right on the MP3 player, it might be beneficial. Or the player could just do it automatically without you having to type it at all.

I think if we go any further than that (ie: installing Window's Vista [ps: Vista? Really? EWWW!]) we'd be a pocket PC which is essentially a palm pilot but more sophisticated.