Amazon Updates the iPhone Kindle App
techcrunch.com/2009/05/20/amazon-updates-the-kindle-app-to-be-more-iphone-ified
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Now supports tap-to-turn-page and screen rotation. (The rotation feature has a nice extra: you can disable auto-rotation for times when you dont want it, like when youre lying on your side).