Dupin

Problem: You have a ton of songs on your iTunes and no idea how to identify and delete duplicates.

Solution: Dupin is a great program to get ride of the duplicates based on the criteria you set. I have the full version.

Cost:
- Free version let's you remove the duplicates for 20 songs at a time.
- Full version ($15) lets you remove the duplicates for up to 5000 songs at a time.

Link: http://dougscripts.com/itunes/itinfo/dupin.php