The Kindle is a fantastic reading device, but it’s almost entirely reliant upon Amazon’s closed retail system for buying books. That’s by design, of course—it’s an Amazon gadget, they want you to spend money on their store. But if you have a collection of eBooks obtained somewhere else, designed for cross-platform reading in another format without the typical DRM, it’s possible to get them loaded onto your Kindle fairly easily.
Source: How-To Geek
