I have had portable MP3 players longer than most people I know (first one: Diamond Rio 500), without ever owning an iPod (current model: Sansa e260, Hall of Fame: Rio Karma). I have never owned a Mac. While I have a copy of iTunes on my Windows Media Center machine, I don't use it much (lately I've been using URGE To Go).
But Steven Levy is a fine writer with a lot of connections and a personal history to the subject matter of this book. And so, it's a very good book, even though I felt like an outsider as I read it (perhaps ironically, I read it on my Treo). As many have noted, it's a bit too pro-Apple/Jobs, and too often Levy slides through with the easy "yes, others were there first, but iPods are cooler" comments. But the overall result is excellent. Since the chapters are standalones, you'll like some better than you'll like others, depending on your interests. My favorite chapter was on shuffle play, which combines history, science, and philosophy in equal parts. (Just remember, correlation doesn't equal causation.)