Sony Plans to Adopt Common Format for E-Books

"... books bought from Sony’s online store will be readable not just on its own device but on the growing constellation of other readers that support ePub. Those include the Plastic Logic eReader, a thin device that has been in development for nearly a decade and is expected to go on sale early next year."

http://www.nytimes.com/2009/08/13/technology/internet/13reader.html?_r=1&hpw