Not so much a hack, but a utility, right?
What is your definition of "duplicate"?
Same file name in two different directories? Same/different file size?
Different file names but matching artist/song names in ID3?
Because of "best of" collections and other compilations, I know I have a lot of duplicates in my library, but it doesn't bother me. What problem are you having that you need to identify and remove duplicates?
If you have three playlists that point to a song in one location, the song is only transferred once (if it's not already on the Zune). If your playlists point to the same song in multiple places, each copy of the song will be transferred.
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