Forget about unsightful running cables or tripping over speaker wires. Logitech announced the world's 1st THX-certified 5.1 speaker system with digital wireless dual rear speakers.
http://digitalcamera.101reviews.com/news/worlds-1st-wireless-digital-surround-system
http://digitalcamera.101reviews.com/news/worlds-1st-wireless-digital-surround-system