The Kindle app for iPad has hit the app store. Kindle for iPad is a universal app -- the same app works on the iPhone or iPad. Almost two weeks ago, Amazon first previewed the Kindle iPad app. The app has many of the same visual motifs as the iBooks app that was released yesterday including visual page swipes and book cover navigation view.
A bit of eye candy that's unique to the Kindle app is that the sky behind the figure beneath the tree iconography will change according to what time of day it is.
Note that books bought through the Kindle for iPad app must be read within the app itself and will not be viewable in Apple's iBooks app, nor will they show up in the Books library in iTunes' source list.
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