Anyhoo, by far, the best feature on my iPhone is the "Genius" feature that's baked in to the iPod. What is Genius, you say? Here's how it works (the following words are Apple's...not mine):
Say you have one song you really love and want to hear other tracks that go great with it. A few clicks on iPod nano, and Genius uses that song to find other songs in your library and makes a Genius playlist for you. You can listen to the playlist right away, save it for later, or even refresh and give it another go.
It's like being given an excellent mixed tape at every touch.
Watch. I'll do it now. At random. I just pressed "Neighborhood #1 (Tunnels) by The Arcade Fire (a personal favorite song of mine, BTW) and here's just the first five songs (of a possible 25) that came up;
White Winter Hymanal - Fleet Foxes
Weird Fishes/Arpeggi - Radiohead
My Moon my Man - Feist
Pizza Catcher, New York - Belle and Sebastian
Ziggy Stardust - David Bowie
Awesome, right? Do this. Now. Go. Make haste. Your music library needs to be listened to in a new way. Stop playing Fleetwood Mac, Rumours over and over again. K? Fanx.