Valve released a trailer showing off Steam's Big Picture mode. The company has billed it as the "World's First First Person Browser." Check out Big Picture, Steam's new mode that lets gamers access all of their favorite Steam games on a television. With the press of a button, Steam displays a new full-screen user interface optimized for readability and interaction on TV. Big Picture has been designed to be used with a traditional game controller, while also fully supporting keyboard and mouse input.
Source: HardOCP