lol @ people reading way too much into the format war.
MS threw in the HD-DVD add-on to market to offer a platform that was competitive to Sony's, and they weren't going to go with bluray for the same reason that sony chose Linux instead of Windows for the PS3 OS. They simply refuse to use their competitors technology if they can avoid it. It probably didn't even matter to MS if HD-DVD won or not, they made some money, and were able to offer a competitive platform for the last year. Now, however, they're either going to let sony have the way with the only console with high-def movie playback, focus on distributing high-def movies online, or bite the bullet and make a blu-ray drive add-on