Just what kind of implications will this have for Amazon? Sure, Amazon might be doing pretty well on their own, but when you have a behemoth of a corporation like Wal-Mart announcing such a move, surely it will affect the sales figures of your devices by some margin, would it not? After all, the more Kindles that are sold, the higher the chances of Amazon making money through the sale of digital content, which might prove threatening to Wal-Mart in the long run as a competitor.
This does not mean that Wal-Mart will no longer sell tablets, but I guess you can rule out picking up a Kindle from your local Wal-Mart in the near future as you might have to settle for the iPad and Nook instead.