Even if you are not a big Apple fan, you must give them the kudos. Apple have managed to sell more than 100 million various iPods since 2001, which is a number that rare industry giants can brag about.
Ipod has become an icon, and the market of iPod add-ons is in bloom. The curious thing about the MP3 player market is that other brands are not even near iPods sales results even though they are sometimes even 10-20 times cheaper.
Sony Walkmen still sold more devices, so Apple still has some milestones to catch.