I wrote this for a specifc purpose*, but hopefully the ideas can be used to suit similar needs. I was helped along by scripts posted here by Dan Decker and Robert Metzker, so I thought I'd share the results.

*My particular need was to duplicate the folder structure of my iTunes Music Library into a spot where it would get backed up, but not copy the music files themselves. What I wanted to back up were the image files I had found/created, and in the process remove them from the library, since they didn't seem to "belong" there.