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.
Open the iTunes Media folder in the Finder
Remove iTunes tracks disassociated from files
Send the lyrics of the playing or selected track(s) to TextEdit
Services menu service copies selected text to the lyrics of the single selected iTunes track
Change the settings of hidden iTunes preferences
Search for lyric sites with Google using info from the current or selected track