Plug in you ipod and make sure itunes recognises it. Then, it should display everything on your ipod. The, you can export it into a different file... (using itunes)
Did you mean you want to copy songs from iPod to PC? If so, many softwares can help you, Like: CopyPod, EphPod, Sharepod, PodUtil,etc.
Here is a guide about how to copy files from iPod to PC. http://www.dvd-ripper-copy.com/forum/viewtopic .php?t=86?sid=2
I hope it helps.