Carl Bialik from WSJ writes: "The adult-entertainment industry could play a big role in deciding whether Blu-ray or HD DVD wins the battle of the high-definition DVD formats, the Wall Street Journal reports. From the article: 'Replicators — the companies that stamp out DVDs — lie at the heart of the matter. Setting up shop to manufacture HD DVDs, which run on very similar production lines to regular DVDs, is easy and inexpensive. Blu-ray requires significant investments in new equipment, and the individual discs in that format cost more to make. Because manufacturing adult-entertainment DVDs isn't as lucrative overall as stamping out titles for mainstream studios, the specialty companies that replicate for adult-entertainment companies don't always have the same resources to gear up for Blu-ray.'"