In other words get it off your iphone in a way that iTunes won't delete it.
I don't know much about the iPhone, only with iPods.
I know that with the iPod you can put it into a purely drive state and copy them off that way. And there are third-party programs that can pull the music, photos and what not off and rename the files to the same way the were before.
Search for iPod (or iphone) recovery or cloning or rescue, something long those lines you'll find some programs that can help you.