Need some iTunes/iPod advice from the clever people on here.

What I want to know is the easiest way to transfer music from an iPod touch to an iPod nano.

Can I back up the music somehow and then put it all on the nano or is there a way of transferring it all directly from one iPod to another.

Regular posters will know the drill by now - no technical jargon, just simple instructions for the hard of thinking.

Cheers good people.