As of version 4, iTunes has a "Replace Existing" option when users are re-importing CD tracks to replace existing tracks. The problem is that iTunes will only allow this option if the ID3 info for the CD tracks and the current iTunes tracks is identical. This script writes the writable info from selected tracks to the info of a CD; when you re-rip, the CD track data is already the way you want it.
(Note: In order to launch this PowerPC-era script on an Intel machine, it must first be opened and then saved using AppleScript Editor, which is located in your /Applications/Utilities/ folder. More information is here.)
Create a text file containing an alphabetical list of chosen tag data
App displays files in iTunes Media folder which are not in iTunes library
Display, create text file listing info of dead tracks
Album-Artist pairs to HTML doc
Convert selected tracks and export the converted files to a new folder
Applet plays tracks with a user-set duration of silence between each track