With Dupin you can:

Very quickly find all sets of duplicate iTunes tracks based on your choice of criteria
Select the "Keeper" tracks from among a number of duplicates automatically using a variety of versatile filtering options
Consolidate the play, skip, and ratings information from all tracks in a Dupe Group to the single "Keeper" track
Re-populate iTunes playlists replacing "non-Keeper" tracks with "Keeper" tracks
Remove duplicate tracks from iTunes and send files to the Trash
Audition tracks with Quick Look
Manage intentionally duplicated tracks
Delete duplicate "dead" tracks
View duplicates in non-loaded libraries created with iTunes' multiple library feature
Sort tracks and view track info
Export a list of duplicates to a text file
Locate tracks in the Finder and in iTunes

In addition, Dupin features: