Combination iPod and Halloween enthusiasts have a growing range of costume options this year.
For a more humanlike costume, try an iPod Hoodie ($24) or the iGuy case ($35).
Or you can always dress yourself up as an iPod, although that will require some homemade ingenuity. iPod Hacks last year featured a guy who raised the bar by making a costume that could actually play MP3s using a Tablet PC for the display and a rewired USB mouse for the scroll wheel controls. Looks heavy--maybe this year he can lighten it up by being an iPod Nano.