Luckily, you can easily integrate Kindle Store into Flipboard. Obviously, it won’t be the way Flipboard does with Apple’s ebookstore, but it works for me, and most importantly – you can adjust content to your own needs. Simply, add RSS feed of Kindle bestselling list to your Google Reader account. Done.
I use Flipboard every day; it's the primary way I keep up with the news in many different areas.
Although I was interested in iBook store integration into Flipboard, I was disappointed because I prefer the Kindle store.
The above article shows you how easy it is to add the Kindle store to Flipboard.