The nation's top retailer will phase out its HD DVD support by early summer.

That's the official word this morning from Wal-Mart, first announced on the company's gadget blog, CheckOut.com.

According to Wal-Mart execs, the company will begin emphasizing Blu-ray in both brick-and-mortar stores and online over the next thirty days, with plans to completely phase out HD DVD movie and hardware sales by June 2008. The company will continue to sell DVDs and standard-definition hardware.

"We've listened to our customers, who are showing a clear preference toward Blu-ray products and movies with their purchases, explained Gary Severson, senior vice president, Home Entertainment, Wal-Mart US.

"With the customers best interest in all we do, we wanted to share our decision and timeline with them as soon as possible, knowing it will help simplify their purchase decision, increase selection, and increase adoption long term. We anticipate enhancing our selection with continued great values in hi-definition Blu-ray products, so our customers can further enhance their entertainment experience at home."

As we've previously reported, Wal-Mart was a key promotional partner for the HD DVD camp this past holiday season, with the retailer prominently featuring a Toshiba HD DVD player in one of its television commercials.

Today's announcement from the retailer comes on the heels of news earlier this week that both Netflix and Best Buy had endorsed Blu-ray.