Looks like YouTube's having quite the day. The site has officially rolled out Leanback, its television-friendly interface first espied during Google TV's big unveiling. The interface works via keyboard arrow keys -- sorry, no option to use the mouse -- letting you scroll through your feeds / recommendations, categories, playback options, and search bar. Videos encompass the entire browser menu and will crank up the HD when available. So far, we're seeing snappy response with navigation, and some utter embarrassment at the (unfortunately accurate) suggestions YouTube is throwin
