Sent to you by Chris Hunter via Google Reader:
Although a longtime pseudo-feature of Amazon's Kindle hardware, their iOS app of the same name now offers the ability to read your books to you with Siri's voice.
The downside? You can't just have Siri read your books to you with the tap of a button. Amazon added this feature to support accessibility for the blind. You have to enable VoiceOver in iOS's accessibility settings before you can have Siri read to you, and even then she only takes on line at a time as you move your finger down the page. It's not the sort of thing you'll actually want to use if you can read with your eyes. For those who are blind or have poor vision, VoiceOver support makes navigating the Kindle app and reading books possible.
Amazon added a variety of other new features as well, including support for their X-Ray service, which provides supplemental behind-the-scenes information for supported Kindle content. They've also added highlights, bookmarks, and notes. For more information on all the new features, check out the full press release over at Amazon.