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 throwing our way.
Meanwhile on the handheld front, YouTube's also pushed live a new mobile site. New touted features include a more touch-friendly UI, further incorporation of the main site's elements such as favorites and ratings, and a generally speedier existence. YouTube also promises to work at bringing update parity across its desktop and portable kin, "unlike native apps which are not updated as frequently" (come on, tell us how you really feel, guys). Since the TV season is in a bit of a lull anyway, might as well grab your iPhone, Android device, HTPC remote, laptop, or whatever other screen you have and play catchup with your viral videos. Promotional footage after the break.