A program to point the iPod's music player to the drive of another computer on the same network over wifi. This would allow you to have a computer on the same network act like an external drive, and give access to as much music as your computer can hold. If you can already view the iPod over wifi, why not the other way around. You would flip a switch, and the program would mount a drive on another computer onto your ipod, rename the ipod_control directory to something else (I think that's where all the music is), and the create a link of the same name to a folder on the hard drive of the other computer. Flipping the switch back would revert the iPod back to it's internal memory.