you dont even need a program...
enable the ipod for disk use and open it up, make sure you can see hidden folders (or the mac equivelant) and go into ipod control fodler then into music
there should be loads of folders with names like F00, F01 etc if you look in these you should find lots of music files with garbled names like GYYD and stuff
copy all these files into your itunes music folder and when you add them to the library itunes renames and orders them for you...