The fifteenth anniversary of the iPod crept up on me. I should have seen it coming, because I’ve spent a lot of time thinking and writing about the device. Given that the iPod was instrumental in the trajectory of Apple from a veteran computer company struggling for relevance to the premier manufacturer of digital products, I feel attention must be paid to the milestone. October 23, 2001 was a signal day in the history of tech. Fifteen years later, it’s worth a look back.