iPod’s fans have made history as Apple announced yesterday that there have been 100 million iPods sold to date, since its launch in November 2001! 100 million sold in five and a half years is incredible and there is no doubt iPod is still the pioneer in music player industry.

Aside from making history, one of the good side effects from this incredible sales is that it brought sales to other products too.

Quoted:
The iPod has also sparked an unprecedented ecosystem of over 4,000 accessories made specifically for the iPod that range from fashionable cases to speaker systems, and more than 70 percent of 2007-model US automobiles currently offer iPod connectivity.

Anyway, if you want to know more about iPod, Wikipedia has a very detailed page for it.