There have been five different models of Kindles. The original, which goes for about $25 on the bay; Kindle Keyboard, which added (as you guess) a keyboard; "Paperwhite" which had a higher res display but still only B&W; the Kindle Fire, the first color Kindle and first to be a real tablet computer; and the latest, Kindle Fire HD, which features a full 1920x1200 display with almost 9 inches diagonal.
There have been four different models of Nooks. The original was close to the original Kindle but is discontinued. The three models offered now are the Nook Simple Touch, a B&W model; the Nook HD, which competes with the Kindle HD; and the Nook HD+, which competes with the Kindle Fire HD with 1920x1280 resolution.
But people are also finding that they can use their regular tablet computers for books. You can download the Kindle App for iPad or Kindle App for Android (or, surprisingly, Kindle App for Nook - yes you read that correctly!) and merely read on your preferred tablet. With the iPad's super-crisp "retina" display, at a higher resolution than even the Kindle Fire HD, typography is great -- and the letters appear in more high-definition than they are on paper.
AND THAT IS ALL YOU REALLY NEED TO KNOW TO SELL BOOKS TODAY.
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