One of the big gripes about the Amazon's Kindle e-reader has been that it doesn't permit people to share the books they have bought. That's starting to change; now, Kindle owners may start lending certain books to other readers.
Eligible Kindle books may be loaned for a period of 14 days to anyone with either a Kindle, PC, Mac, iPad, iPhone, BlackBerry, or Android device. According to Amazon's web site, whether or not a book can be loaned is decided by the book's publisher or rights holder. Check this link for more details.