Simply share your iTunes library. iTunes shared library. If the files "are" still in your iTunes library then iPod should still be able to see them. Remember the LW playlist that shows up in iTunes is simply a reflection of the files in your LW downld folder. You can play them but not copy or burn from that playlist.

Perhaps you should start using manual updating of iPod. I believe it's much safer. Otherwise iPod deletes all files & replaces them with what's in iTunes or the playlist you copy across.