Even the music in your favorites list can get old after a few months. If you want to skip a song you’ve heard too many times, you can always tap on the Next button in iPod’s Now Playing screen. But with OS 3.0, it’s even easier. Simply shake your iPhone or iPod touch while you are listening to music and the iPod app will skip to the next song. This feature also works with videos and audiobooks.
Note that you must be in the iPod app for this feature to work. You can’t be listening to music in the background while you’re using another app.