Kindle App for the iPhone
Product mentioned in this article
The new Amazon Kindle for iPhone app is available for free from Apple's App Store. It turns your iPhone into an e-book reader and lets you flip through the pages of your electronic books by swiping your finger across the screen. It features the ability to resize the text and works with Whispersync technology so that if you close the app and then restart, it will take you the last page you were reading.