Steve Jobs unveiled the first iPod on Oct. 23, 2001, nine years ago today


Here are the stats:
- Age: 9 years
- Units sold: 278,545,000
- Net sales: $47,833,000,000
Note the seasonal patterns of quarterly sales in the chart, with Sonic-the-Hedgehog-style Christmas spikes. Note also the major inflection points, when sales accelerated:
- Q1 2004: iTunes for Windows
- Q4 2004: iPod mini, clickwheel, overseas expansion
- Q2 2005: iPod shuffle
- Q1 2006: iPod nano
- Q1 2007: Entire line overhauled
- Q1 2008: iPod touch
By 2006, the iPod was Apple’s (AAPL) single largest source of revenue, bigger than the Mac. Today it accounts for less than 10%, eclipsed by the iPhone, the iPad and the resurgent Mac. See Horace Dediu’s chart below (he’s got an updated version here):

Below, per request of reader RattyUK, a chart of iPod unit sales with “the other iPod device,” the iPhone, added in.

For a photo retrospective of the iPod’s first nine years, see Dan Frommer’s slide show in Silicon Alley Insider.
[Follow Philip Elmer-DeWitt on Twitter @philiped]