Amazon already has a Kindle app for BlackBerry, so it's not surprising that it announced that it will release an app for BlackBerry's upcoming , which has a 7-inch touch screen and will be released in early 2011.
In case you hadn't noticed already, part of Amazon's strategy for selling e-books and expanding the Kindle platform is to make sure that its Kindle app is available for a variety of mobile devices, the more the better.
"When you buy a Kindle book, you can already read it on iPhone, iPad, Android, PC, Mac, BlackBerry, and, of course, on your Kindle, Kindle 3G, and Kindle DX," said Dorothy Nicholls, director for Amazon Kindle. "We're very excited to add the new BlackBerry PlayBook to that list. As with our other Kindle apps, the BlackBerry PlayBook app will be free and will incorporate our WhisperSync technology so you can seamlessly switch between devices."