Kindles: Amazon has a larger catalog of modern books because amazon has been in the e-book market longer than anyone other.They have 2,00,000
Kindle exclusive e-books with many from the famous authors who publish directly via amazon.There are not many choices to buy e-books for the
kindle from other stores or free book sites.The bought books are stored in the cloud.Just keep the local copies of the books.You can also lend a book to a friend once for 14 days.Amazon also has
kindle lending
library which is currently available only to amazon prime subscribers.Thus via this
service borrow books and read without buying.You can also read e-books loaned from the
public libraries.Getting the loaded books onto the device is simpler on
kindle unlike the nook.The books can easily be downloaded wirelessly via whisper sync
service (an AT&T 3G powered connection).