[pietvo]

They sell two types of books, eReader and ePub. You never know in advance what you will get, because they don't tell you. There are a few other ereaders that can read their eReader format (iRex 800 and jetBook-Lite are reported), but most cannot so you have to be careful. Moreover, their ePub format has a relatively new form of DRM that is supported only by a handful of ereaders. AFAIK the Sony doesn't support it. So it is safer not to buy B&N ebooks for other devices unless you are willing to remove the DRM and convert them. Some say removing DRM is illegal, at least in some countries.