I have several MP3s on my PC and all the ones you download through Bittorrent etc. are mostly encoded in that format. I know that the ipod can play MP3s but the ones they sell on itunes are MP4. The amount of songs they say it can play (eg. they advertise the 80gb can play 20, 000 4 min. songs) are in MP4. So I was wondering whether you think it is worth converting my MP3s into MP4 using Nero7 to fit more onto the ipod. Or is the amount extra you can fit on their not worth it? Thanks.