A nice hands on look here: http://arstechnica.com/media/news/20...eplacement.ars
The Cloud Reader's Kindle Store is not at all designed like Amazon's normal website—instead, UI elements are laid out in big, touchable areas and navigation is designed for the touchscreen user.
The Kindle Bookstore looks very nice on the iPad.
What is missing so far (probably will be added at some point)
1) Adding notes or highlights (but you can see the ones you added already)
2) No Newspapers or Magazines
3) No search for keywords
4) No built in dictionary
Nice to have another option, anyways-and another way to buy books on the iPad.