The flat-screen TV revolution of the past decade has been powered by just two display technologies: plasma and LCD (the latter powered by fluorescent or LED backlights). Another contender--OLED (organic light-emitting diode) technology--is already widely used in phones, but it's been too costly to scale up to big-screen TVs. But LG says it's made a breakthrough: the company is pledging to deliver a 55-inch OLED TV before the end of 2012. It may cost upwards to $8,000 to $10,000, but that will get you a pencil-thin display with (hopefully) better-than-plasma black levels. We can't wait to see this one in person.