The iPod cycle
The iPod cycle

Originally priced at $399, the iPod took a while to get going. But the 2003 introduction of iTunes, followed by 2004's Mini and 2005's Nano, made the iPod a cash cow for Apple -- especially during the holiday season. In every year since 2004, holiday quarter sales have more than doubled the average iPod sales in all other quarters.

Last updated October 05 2011: 8:16 PM ET
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