Ricoh develops new color e-paper... will be available in 5 years

Ricoh has developed a new color e-paper technology. They claim that the new tech is 50% brighter than other technologies, and retains the picture when power is turned off.

Ricoh color e-paper

Ricoh's e-paper uses "layered electrochromic compounds", without glass - using a clear insulation layer of some sort - resulting in lighter and brighter devices.