Easiest way would be to stop the LW playlist appearing in iTunes. If you want to do that, go to LW's preferences -> iTunes -> Sharing & disable the sharing option.

If you do want to keep that function, then manually update your iPod instead of automatic updating it. See how to manually update here http://www.apple.com/support/ipod/tu...tarted_t3.html & watch the video & click on the read more.