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.
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
Set choice of various number tags of selected tracks incrementally
Locates pairs of track entries pointing to the same file
Displays files in iTunes Media folder not in iTunes track library
Perform various tasks on a selection of playlists; rename, delete, duplicate, merge, more
Copy chosen tag info from one set of tracks to a different set of tracks