iTSync has four main functions: Synchronizing the users playlist with the folders iTunes is point to, finding and removing duplicate tracks in iTunes based on 11 different duplicate searching criteria, removing dead tracks (tracks marked with an exclamation point in iTunes), finding and adding or removing tracks not allocated to a user defined playlist.
iTSync is not limited to the above listed features.

iTSync keywords: itunes, itsync, ipod, duplicates, exclamation point, update, itunes library, itunes synchronization, synchronization, library synchronizer, song synchronizer, folder synchronizer, dead tracks, back-up