Sony on Tuesday unveiled a sleek next-generation PSP Go handheld videogame, movie and music gadget in a direct challenge to Nintendo's freshly-launched DSi devices. Sony Computer Entertainment president Kaz Hirai showed off a new PSP Go at a press conference in the Shrine Auditorium as a major Electronics Entertainment Expo (E3) got under way nearby in Los Angeles. "We call it the worst kept secret of E3," Hirai quipped, referring to news of Go news leaks more akin to streams. "There will be more content that is easier to get on your PSP. It's entertainment everywhere." Go is half the size of the original PSP and built to download and store video, pictures and games, according to Hirai. Go devices have built-in wireless Internet and Bluetooth capabilities.