I did a search for this and didn't see much in the way of hits, especially anything that is new. For some odd reason when I was moving my mp3s over to my Mac from my old PC hard drive I thought everything was fine. Only until I was in the car looking for a song did I realize albums were missing! I was hoping to find a recommended application that will not only let you record what albums you have, but also sync with iTunes and identify the gaps. A quick search yielded two solutions: Collectorz Music Application - http://www.collectorz.com/music/ CDPedia - http://www.bruji.com/cdpedia/ I'm not sure that the Collectorz solution allows identification of CDs not in iTunes, but perhaps I missed something. Does anybody have feedback on either of these? Others that I may have missed?