Dear Publisher,I think next in line will be PLR and Resell Rights ebooks on Kindle. There are so many copies of the same book for most of these (not to mention that most of them are crappy too).
We're implementing a new standard policy that improves the customer experience problem caused by multiple, undifferentiated copies of public domain titles in our Kindle catalog.
Our vision is to have high-quality editions of every public domain title in the world available on Kindle, including a free edition of each, and to avoid the confusion that is caused by having a large number of undifferentiated versions.
To protect the customer experience, we will stop accepting and selling duplicate, undifferentiated versions of public domain titles. We will continue to offer differentiated versions, such as unique translations or illustrated versions. Please make sure the titles that are live on your bookshelf adhere to this new policy and that each clearly describes, in the title and description fields, how it is differentiated by February 6, 2011.
So, if you're into this game, differentiate your PD books as well as your PLR books (always a good idea in any case).