yamipod
http://www.yamipod.com/main/modules/downloads/ will copy all the music from your iPod to a folder on your computer.
They will then have to be copied to iTunes so they can end up in your iTunes Music folder. This folder is what iTunes actually displays.
Excellent stand alone programme. Open it, plug in your iPod and all the music on it is shown and ready to select and copy.
It saved my life when my then 10,000 track iTunes Music folder corrupted and I lost it.
BUT...If you have all the music on another PC in the iTunes Music folder then the easiest way is to copy that folder
(copy the whole folder and not just the music inside it) to an external drive and then replace the new PCs iTunes Music folder with that one
and when you open iTunes on the new PC it will display all the music exactly as it was before.
Sorry if I don't make myself perfectly clear but I find all of iTunes dead easy to use but harder to explain.
I've put 20,000+ tracks of all kinds into my iTunes and if I don't know how it works by now, then I might as well give up. :wink:
A word of caution/warning.
It can take years of work to build up a large iTunes music library
and iTunes is well known for corrupting and losing the library, so it is best to regularly back up the library to another drive/disk.
This applies to all valuable data you have on your computer.
All data should be backed up to a drive/disk that does not contain the windows operating system because if Windows corrupts you can also lose everything. :evil:
John.