confusing

My iPhone has a nifty button in the lower right of the main screen which says "iPod". Amazingly, it works. Also note that an iPhone has on-board storage roughly on par with an iPod. That storage is really only useful for music, like the iPod's. It even has a headphone jack and comes with earbuds (and no mic). It's reasonable to assume that the iPhone is the upgrade path for the iPod, and may even contain the same software.

Trent Reznor may have "released" the app on the Apple store last May, but only after it was rejected by Apple without immediate clear explanation. It didn't seem like he thought Apple really knows how to deal with "digital" media.

By the way... even if common usage is incorrect, CDs are most definitely digital. That was a major selling point, when they came out. It's like saying the newest cars are examples of the overall explosion in gasoline technology.

Some ipods (the so-called ipod touch) run software similar to the iphone, and now the ipad, called 'iPhone OS'. (It is a modified version of Mac OS X.)

All three devices can play music and can use the app store (but the ipod can't connect to the cellphone network.)

I enjoyed when my nephew demo'd BBC iplayer to me on his ipod touch.