Has Sony gone mad? Prominent adult movie producer Digital Playground (site) says it is forced to use HD DVD instead of Blu-ray, because Sony does not allow XXX-rated movies to be released on Blu-ray.

Update:
Vivid announces Blu-ray Porn Movie

It does not matter how you stand to porn. It is here and it is a massive business. It is also an industry that is an early adopter for new media technology. VHS might not have won with out the adult film industry adopting it.

German Heise has interviewed Joone the founder of Digital Playgrounds at the AVN 2007 show in Las Vegas. Joone says actually said last year he is committed to Blu-ray. Now they announced four HD DVD titles in the United States. In the interview Joone says he was forced to use HD DVD, because no Blu-ray disc manufacturer would make his discs, because Sony was against it and they would loose their license.

If this holds true, Blu-ray is at a major disadvantage and could fail.
The Blu-ray backers just announced numbers that they interpret to mean that Blu-ray will be the winning HD format. If you restrict content to be published on Blu-ray you will loose.
In any case get a dual format player.