I have done this a few times, all you need to do is copy all the folders from your pc to your macbook, you can do this over a network, or if you have a 6-6 pin firewire cable you can attach your macbook as a firewire drive if you hold down t whilst booting the mac. you can then just copy the files over.
once you have the files on your macbook, just import the files into your library.
M.