100 Million iPods Sold, But How Many Are Still in Use?

Like everyone else, I'm impressed that Apple has sold 100 million iPods. It's incredible, really, and a testament to how well Apple has designed and marketed them. I do wonder, though, how many are still in use. A whole lot less than that, no doubt, given how many generations have come out (and no doubt how many batteries have run out of juice, probably prompting many users to just buy a new and better one). And I'm sure that's nothing unusual for any consumer electronics product. Seriously, does anybody have any idea how many people now use an iPod, besides the "tens of millions" Apple suggests? I'm just wondering how much iPods have spread into mass use vs. fairly tech-savvy folks.

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