It has been quite a week for virtual worlds, the three-dimensional sector of the internet where people can live a parallel existence with their own avatar or alter ego. The world's most profitable virtual game, World of Warcraft, which has more than 11 million paying participants, released a long-awaited expansion that generated midnight queues as enthusiasts vied with each other to steal a ...

Following in the footsteps of Nintendo's popular "Wii Fit," the video game publisher known for the "Madden" football games is jumping into fitness software targeted mostly at women.