This stay-open applet watches your playing tracks and when an un-rated track starts playing displays a window with a demand it be rated.
While you could easily rate the current track from the iTunes icon in the Dock, this script interrupts you and compels you to do so.
OS X 10.6 or better only. Previous universal version available at the link below in the "Info" section.
This window will pop up when a new song begins playing.
Display, create text file listing info of dead tracks
Send current song info to clipboard
Export artwork of selected tracks to parent or specified folder
Re-associate batch of dead tracks with files from selected folder
Export files of tracks in two or more playlists to single folder
Set choice of various number tags of selected tracks incrementally