It does apparently contain a 56k modem (from what I understand of the information they've released), and they may be getting a little more out of that bandwidth than usual since it may be able to eliminate some of the bandwidth overhead of a dialed up PC (banner ads in the player, mail clients checking messages in the background, ... -- not much, but maybe a bit). I read somewhere that they did say it was preferable to use the broadband connection. A modem chip probably didn't add much cost (not like adding 802.11 wireless connectivity would have).

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Gonk