If you are using Windows, plug in your iPod, open "My Computer" as if you were browsing your various drives, at the top of that window click on "Tools," then "Folder Options." In the next window that opens, click on the "View" tab and select the option to "Show hidden files and folders," then "Apply" and "OK."
You should now see a folder called "iPod_Control." Inside that folder is where your music folders and files are located.
Enjoy.
-JT
P.S. - apparently this works on all but the iPod Touch.
P.P.S. - I've never done this since I don't have an iPod or any other Apple products.... I'm just a google ho.