Actually the reason is becasue there's software that will record each song as MP3 and include the appropriate ID3 tags for title artist, etc.
XMPCRs have a USB port that allow you to control the radio. Rumor has it that they're trying to avoid the problems with the RIAAssholes. The Roady home adapter kits don't have USB control. The home kit is a cradle that supplies power and antenna connections.
Some posts in XM forums are also suggesting that the forthcoming SkiFi 2 cradle is being redesigned to leave out USB.
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