Packing up for Maker Faire, I was debating whether to bring my old iPod as a back-up to my iPhone. That got me thinking about ways I might make use of my iPod besides just insuring music and address book redundancy. On TravelHacker, I found this round-up of 75+ tutorials on everything from turning it into a guitar tuner to using it as a universal remote, to an ebook reader, to turning it into money (ah, as in selling it...).
How to: Turn Your iPod Into Anything (75+ Tutorials)
http://blog.makezine.com/archive/2008/04/75_things_to_do_with_an_o.html