To a different computer, and put my ipod's music onto the computer itunes, instead of the other way around?
called Senuti. I think the full version is not free so I'd recommend torrenting it
Used this a few times. Works like a charm.
http://www.copytrans.net/copytrans.php
I don't remember paying twenty bucks for it though. And the one time purchase guarantee is bullshit. You have to repurchase it for later versions. My two cents.
I did it guys, yay.
All I had to do was go under Summary, and check "manually manage music on iPod"