Obviously ePaper can be used to read eBooks.

Several eBooks platforms propose ePaper  to their readers :

• Amazon Kindle Store for the Kindle
  
• Sony eBookStore for their eReaders
  
• Barnes & Noble eBooks store for the Nook

But its also possible to use other eReaders when the eBook seller follows standard formats and doesn't block it too much with DRM.

Links

• http://delicious.com/appepaper/ebook