Yes, Amazon has announced that it has updated its Kindle app to support the Retina display on the Apple iPhone and Apple iPad. But Amazon didn't stop there. No siree Bob. The online retailer and manufacturer also changed the library design which now allows you to switch back and forth between cloud view, which shows all of your purchases, and device view. The latter shows only those titles that you have downloaded to your Apple iPhone or Apple iPad.
We have to give Amazon a big thumbs up for anticipating the release of the Retina display enabled iPad and getting the update out in time.
source: iTunes via TUAW