Here is a random thought that I had driving into work the other day: what if Apple were to combine the sudden motion sensor technology that they have in the MacBook with the iPod? Then, on the iPod, if you wanted to ‘shuffle’ songs you could simply shake your iPod in a certain way, an viola!, tunes are shuffled. This could even be used to advance or replay a song.
Obviously this would need to have some sort of a button or some other ‘release’ that would allow this to work. Otherwise, the simple act of walking around or jogging would be forever activating this feature.