Amazon sees it necessary to announce now that they have put their support behind Blu-ray.

As part of this announcement, Amazon.com will more prominently promote Blu-ray hardware and software products on its website.
"The high-definition landscape is rapidly changing, and consumers are looking for guidance on how to make the best high-definition buying decisions," said Peter Faricy, vice president of movies and music at Amazon.com. "Our customers have clearly voiced their support for the Blu-ray format. Blu-ray titles have increased from just over half of our high-definition sales to over three-quarters of our high-definition sales since early January. In order to best serve our customers, Amazon is recommending Blu-ray as the preferred digital format and will continue to carry the 'Earth's Largest Selection' of Blu-ray products."

Not sure what Amazon wants to tell us with this announcement. HD DVD is gone. There is no choice anymore for high definition. To help consumers, Amazon could just clean their catalog of all HD DVD players and discs right now. There are already bargain offers for HD DVD players and HD DVDs from other stores, but each Dollar spent on these is wasted.
Via Amazon.com.