PC World – So much media, so many ways to watch it on your HDTV. That’s the quick take on the media-streaming landscape following a year of explosive growth in the number of set-top boxes, a term that has come to mean pretty much any device that connects, and somehow delivers, video, music, and still images to your set. New, high-profile streamers from Apple, Boxee, Logitech (running Google TV), and Roku put the category front and center.