50 Essential Android Apps - Datamation:
"7) Amazon Kindle for Android
Want to read an electronic book, newspaper or magazine but don't have your Kindle with you?
Or don't have a Kindle at all?
It's not a problem with this app, which allows you to read any of 900,000 Kindle-formatted books with your Android device.
And Amazon's Whispersync that your last page read, bookmarks, notes and highlights will sync across your various devices.