I've been researching eReader devices online. I'm currently looking at the Sony PRS300. I was thinking of stopping at Best Buy tomorrow to have a look at it. But, I'm having trouble understanding the file format. I know Sony has a store to buy books, but what about Amazon and Barnes and Nobel. Will eBooks purchased from them work on the Sony? The Sony Supports a variety of media formats Including ePub, BBeB, Adobe PDF, TXT, RTF and Microsoft Word text formats.