Format war over, HD-DVD wins by way of pornography appearing on it first. Over in Japan GLAY'z, known for its "Brand-new-century-visual-super-exprotion-entertainment," just released the world's first adult film on HD-DVD entitled (if machine translation isn't too unreliable) "Slave Room." Public fornication aside, it's pretty significant since everybody and their mom knows that whatever format the adult industry supports is automatically the winner, or at least that's how the story goes.
The movie includes both an HD-DVD and standard DVD version due to HD-DVD's small penetration rate thus far. It retails for about $52. Screenshots can be found on GLAY'z Web site (Google it). Needless to say, it's NSFW.
UPDATE: As luck would have it, it appears that another adult HD-DVD is already out there by the name of Pirates. It's some sort of epic production with lots of pirate-on-wench action, just the way we like it here.
The world's first Adult HD-DVD is here [New Launches]