Replying to Transferring music from Ipod into a new mac....help.

Ok so i got an Itouch for christmas, all of my music in my library is on a windows that is slowly dying and i want my music on our new macbook. My older Classic has all the songs i want from the older library, but i want to transfer them to our newer Itunes library on our mac without Itunes wiping my ipod clean. Anyone know of any free programs that will transfer my ipod music into a new itunes library?