I don´t know about ITag but i can say i used about 5 different Mp3 Tagging software and the best by far is Trainspotter - http://www.tspotter.net/
It´s free and it basically finds the release of your mp3 on Discogs and Beatport and gives you the options (cause the same mp3 is very often released in compilations and re-editions etc...). You tick the one it corresponds to and voilá... It not only tags all the fields of the mp3 correctly as it adds the artwork.
Totally recommend it to all digital DJ´s.
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