A really good iTunes/MP3 de-duper. Should have the following all in one package: - Talks to the iTunes library file (IE - doesn't just edit the filesystem) - Undo/non-destructive final delete. - Smart/fast search that reflects how iTunes handles duplicates. Should smartly leverage the following: - Filename compare: filename/filename-1/filename-2 - Files with identical sizes, then binary compare - Metadata compare (title, album, time) - Allow auditioning of tracks - Smart delete options - Select all lower bitrate duplicates, select all filename-1, select all duplicates from path X. - Preserve/combine metadata from duplicates (IE - combine play counts, ratings, copy tag if tag in target is missing, etc). - Clean out missing items from iTunes library. - Vast amounts of idiot-proofing (list files/entries to be changed, confirmation dialogs for any modifications, etc.)

I've yet to find an iTunes manager that has all of the above - Most fail at the smart de-dupe search so when I get pages of results, I still have to audit each entry.