Movie nerds and videophiles rejoice! The world is one step closer to having a single high definition home video format. Warner Bros. delivered a crushing blow to Microsoft and Toshiba’s HD-DVD on Friday by announcing that they would release their movies exclusively on Sony’s Blu-ray format as of May 2008. Michael Bay, probably the only person on the planet who cares about such things, is reportedly uber-psyched about all those Harry Potter flicks showing up on his chosen format.