If you already own a Kindle device and Kindle content, you can download your existing content to a new Kindle device. Download your books stored in your Kindle Library directly to your Kindle wirelessly through Archived Items. You can also transfer personal documents, MP3s, or Audible files from your computer to your Kindle device via USB.
In the Case of E-books For your Kindle Device either from your PC or Internet there are Few Sites Where you can find free E-books and transfer it to your Kindle and For Transferring your Books From your laptop or Pc if you have digital copies of books that you want to read on the Kindle, but they won’t display in their current format? Try installing Calibre (calibre.kovidgoyal.net
For Google Books if they are in .Epub Format
(ePub is now a standard e-book file format that is supported by almost* every e-book reading device include Sony Reader,BeBook, IREX Reader
, iPhone and the upcoming Nook
from Barnes & Noble’s.
For Converting .EPUB to .MOBI format use Calibre (calibre.kovidgoyal.net) as .MOBI format is Supported by Kindle Devices.
How to Read Kindle Books without the Kindle Reader on your Web browser :
If you don’t have the Kindle device (i.e., the hardware), you can still download any of these Kindle books and read them in your web browser (read.amazon.com) without having to install any software. Amazon also offers reading apps for your Windows PC, Mac, Android, iOS, etc. so you can enjoy your favorite books on your desktop computer, tablet or mobile phone without having to buy the Kindle Reader.
For More Free Kindle Books you can Try Searching on google and you Can also buy the Free E-books from amazon.com.Few of the Books are Free on Amazon for Downloading it will show the price of book 0.00$.
Refrences : Labnol.org & consumerist.com