iTunes script question

[Aperture]

Hey everyone. Recently, I made a Smart Playlist in iTunes that ONLY shows the checked songs from my libary. My library has been getting kinda big, and I wanted to cut it down to the stuff I actually listen to. In doing so, I'd like to have a script to delete the songs not checked. Optimally, it would be able to just move them to a designated location (as in move the non checked song files to my desktop, for example) so I could archive them onto my external HD.

Any help appreciated.

Thanks