"CULVER CITY, California — On an unseasonably cool Monday afternoon on the Sony Pictures studio lot, the electronics giant that brought Spider-Man to the big screen unveiled a blockbuster of another sort: the new PlayStation 3. Set for release in spring 2006, Sony's machine will arrive in stores just months after Microsoft's Xbox 360, the heretofore most powerful gaming machine on the horizon, announced last week for a release this Christmas season."