I just went through the same thing, bought a Macbook as well!
Well, you would basically have to either put all of your video's, pic's, music on an external HD and then start from scratch, that's the hard way.
You can also buy iPod access which I did to get all of my playlists and music on to the new computer.
As for the FULL BACKUP, I will find the page that showed how to get to it on your PC, I copied the folder and put it on 2 external HD's I have just in case my phone ever went bad..
I'll post up how to do it when I find it tomorrow! But I don't think you can put the folder and files on the macbook and then sync it to iTunes somehow so it knows its a backup, very irritating and complicated
