Ahead of the release of iPhone OS 3.0, Amazon has launched a new version of its Kindle Store optimized for the iPhone and iPod touch. Accessible from the “Get Books” button in Amazon’s Kindle for iPhone app, the new site opens pages in the Safari browser, giving users the ability to make one-click purchases of the Kindle Store’s 280,000 books without using an in-application downloading mechanism. Notably, Apple has announced…