There are couple of options:
- Corral iTunes Dupes v1.0 (free)
http://dougscripts.com/itunes/scripts/ss.php?sp=corralitunesdupes
This script will check your iTunes library for all instances of tracks which have the same user-selected criteria (name, album, artist, size, and so on) then assemble those tracks into a discrete "Dupes" playlist. Once corralled, you can decide which can stay or go.

- Dupin ($15)
http://dougscripts.com/itunes/itinfo/dupin.php
It is paid better features of Corral iTunes Dupes
Some of the features:
# 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
# NEW! - consolidate the play, skip, and ratings information from all tracks in a Dupe Group to the single "Keeper" track
# NEW! - re-populate iTunes playlists replacing "non-Keeper" tracks with "Keeper" tracks
# Purge duplicate tracks from iTunes and send files to the Trash
# Manage intentionally duplicated tracks

- Better iTunes song deduping (free)
http://www.opensourceconnections.com/2006/11/11/better-itunes-song-deduping/
This is essentially 'hacked' version of Corral iTunes Dupes.
According to the author:
His version uses some wicked fast PERL to find all the duplicate songs based on info in the Library, and then puts them all in a Dupes playlist. However, I wanted to filter by Name, Artist, and Album, and have a single playlist where I could delete in one fell swoop all the duplicates. So I tweaked his AppleScript to have another prompt that asks if you want all dupes to go in the playlist, or just copies 2…X to go in.

- Phelix 1.1.7 (free) - also available for XP, Vista and Universal Web Launcher
http://www.pekarna.si/
http://www.pekarna.si/deploy/apps/Phelix_MacOSX.dmg
Phelix is a duplicates removal tool with acoustical audio matcher. Goal of the application is to find duplicated audio files insidie selected folders. Duplicates with bad or missing music-tags but same or similar sound will be detected by audio matcher.
Audio matcher will detect duplicates even if audio signals are shifted; started at different moments; if audio signals are ripped with different bit rates; if audio signals are ripped with different volumes.

- iDupe ($8)
http://www.woodenbrain.com/products/idupe/idupe.html
iDupe deals "Show Duplicates" in a smart way. Playlist entries which refer to exactly the same file and “dead tracks” are treated as unambiguously undesirable.
Other potential duplicates are ranked according to a number of criteria, which include whether a song is likely to be a loose single, what the best bit rate is, etc.

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