From iphone to computer

Hey guys!
My old computer crashed and died... and now everytime I want to listen to my music I go oh crap, I have no music on this laptop.. and I really don't want to destroy my bandwith downloading every single song on my iphone :S... and because of this, it means I'll also be unable to upgrade to 4.1 when it comes out

anyway, do any of you know of a free method to transfer all my songs (+ vids/photos if possible) from my iPhone to the computer?

Thanks