We knew that Amazon was planning on bringing their Kindle e-books to other devices, but we didn’t think it would happen this soon. This evening, Kindle for iPhone was released on the App Store, available for free. In a nutshell, you are able to associate your iPhone or iPod touch with your Amazon account, and can then buy Kindle book content and have it sent to your phone for reading. Kindle for iPhone is also compatible with the Whispersync service, which allows you to continue reading any Kindle content from where you left off, no matter which device you are reading on. That means you can start reading on your iPhone, stop, then power on your Kindle and continue from the same page you left off on. Very nice.

If you are a Kindle or Kindle 2 owner, and you’ve purchased books for those devices, when you download Kindle for iPhone you’ll have an Archived Items category that will list all your purchased books, which you can access immediately. In using the app, we found that it works extremely well—not as well as a Kindle, mind you, but as an extra way to read the e-books (or as a way to save yourself the $359 Kindle price tag,) the app shines. Go ahead and hit the App Store to grab Kindle for iPhone.