Another fun thing to do is to do
ln -f /Volumes/<iPod_Name>/iPod_Control/Music/F{0-9,0-9}/* /Volumes/<iPod_Name>/Music
At which point, when you open iTunes, hold Option, create a new Library, point it to the iTunes Music Directory, Scan for files automatically, do not manage directory.
Now, when you plug your iPod into your computer, just open it up in Finder and click on the iTunes Library.xml file and iTunes will open using your iPod locally for your whole library. Even better, you can copy directly from there to your computer or to another iPod with a simple drag-drop in iTunes.
All it takes is using a little bit of the Terminal.