Amazon has released a free application that delivers Kindle book-reading to the iPhone:
Kindle for iPhone allows Apple iPhone and iPod touch owners to read Kindle books using a simple, easy-to-use interface. You can shop for hundreds of thousands of books at www.amazon.com/kindlestore, and wirelessly transfer the books to your iPhone or iPod touch. Enjoy Amazons low prices on Kindle books, including New York Times Best Sellers and most new releases for $9.99, unless marked otherwise.
Features include:
- Buy a Kindle book from your Mac, PC, or iPhone using a Web browser and wirelessly transfer the books to your iPhone
- Read first chapters of any book for free before you buy
- Download the Kindle books you already own for free -- they are automatically backed up on Amazon.com
- Adjust the text size, add bookmarks, and view the annotations you created on your Kindle device
The iPhone client will also allow you to seamlessly switch back and forth between your Kindle device and Kindle for iPhone while keeping bookmarks and reading location synced between the devices. The Kindle is Amazon's electronic book reader that was recently updated to version 2. Amazon had promised that Kindle content would become available for mobile phones which had led to speculation that they might support the iPhone.
App Store Link: Kindle for iPhone, Free (U.S. Only)