my mother in laws pc has become unavailable and she wants to migrate the music onto her new pc but (sh)itunes wont let her as you can only sync with one pc. it wants to reformat the ipod and start a fresh.

Is there a free way round this. When I did this on the wifes ipod video I used yamipod to back everything and then re-import after the reformat.

Unfortunately yamipod doesn't support the ipod touch.

Anyone have any advice

Try this (free) - http://www.getsharepod.com/about/

or maybe this - http://www.copytrans.net/copytrans.php

Not had much time to read up on either I'm afraid.