I should point out that HD is NOT the reason those pics look better. It's the fact that HD-DVD uses MPEG-4 HD and VC-1; either codec show pictures at a much higher quality than MPEG-2.
EDIT: Also, the fact that the pics are shows at the same resolution, does make it less clear how those codecs improve the picture.
A flashy-first game is awesome when it comes out. A great-first game is awesome forever.
Plus, just for the hell of it: Kelly Brook at the 2008 BAFTAs