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.