The cd/dvd version is out of print, but the DualDisc version continues to be sold. Why didn't they discontinue the DualDisc one instead? I realize that the cd/dvd version was a limited edition, but they could have put out a standard edition instead of not making the regular cd at all. DualDisc blows. I'd rather have the lousy book package the cd/dvd version came in than a disc that's denser than a standard disc, and can potentially damage your equipment whether it's your cd player or dvd player.