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.
Sort purchased tracks into discrete playlists by name or account ID
Perform search-and-replace on text in your choice of tags
Set choice of various number tags of selected tracks incrementally
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
Batch merge and/or delete playlists
Renumber order of selected tracks