http://www.nytimes.com/2007/12/23/business/23novelties.html?ref=business
This is potentially huge in terms of the future of display technology. Currently, everything with a LCD, from your cell phone to your computer screen uses a backlight. That backlight is the biggest power draw of the whole device, and is the main challenge to battery life designers. An OLED, or Organic Light Emitting Diode uses basically a form of phosphoroluminescent lichen to light the display instead. Entirely eliminating that power draw in the process. With the new Lithium Polymer batteries that are starting to make an appearance in devices, this could potentially be huge in terms of laptop and cell phone design. I doubt you will see batteries much smaller than they are currently, but with the same size Lithium Polymer battery and an OLED display, i'd expect laptop life to go from hours, to days.