Mashduo lets you compare your iTunes music with all of your friends. You just need to drag and drop in you and your friend's iTunes library files, and Mashduo will compare them. You'll get a report of all the songs you two don't share. You can then export to a file or email the list to your friend. You can even zip up all the songs your friend doesn't have, so you can let your friend sample them.
iTunesXMLparserUse this application to parse an iTunes XML exported library file and export the records as a text file (tab delimited)...
Add files dropped onto iTunes library and copy them to a specific user playlist.
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