I recently bought a Nitrus mp3 player and love it. What I like is that it stores hundreds of songs, has rechargable batteries which can last me weeks, and it's got a simple interface (though I do wish the display text size could be adjusted). What I didn't think about was how I was buying a "multi-faceted transformative device" which allowed me to "manage space, time and the boundaries around the self."

But this is the kind of stuff Dr Michael Bull thinks about, all the time.