Interesting news. HD DVD "Insiders" have consistently downplayed the importance of 51GB disc. But, it is good "bragging rights".
And that triple layer "twin format" has a lot of potential. So far on ly one titles has it - a Japanese Anime title called "Freedom", and it was limited to only 15 GB HD DVD & 4.5 BG DVD. But it's slick. It only has the data one one side, a label on the other. It has both DVD and HD DVD layers. You stick it in a regular DVD player and it starts up the DVD. You put it in an HD DVD player and the menu asks which version you want to play. Could be key in transitioning from DVD to HD.