Looking to capitalize on the digital music player's sales success over the holidays, auto electronics makers are rushing to develop plug-in adapters that let drivers pick tunes from their iPods using the controls of their car stereos.
It's a market that can't be ignored: Some retailers sold out of Apple Computer's iPod during the holiday shopping blitz. Analysts estimated Apple sold more than 4 million iPods during the holiday rush; that could push the number of iPod users to 10 million.
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