2muchcoffeeman said:
Just released: Kindle Reader for iPhone and iPod Touch. Free.
http://www.nytimes.com/2009/03/04/technology/04kindle.html?_r=1&partner=rss&emc=rss
I downloaded this app when it hit the App Store on Tuesday. I've downloaded a few books.
The biggest issues for me were how readable would the "page" be, and how easy (or difficult) would it be to actually read a book.
Opening and reading a book is fairly easy. The books you've downloaded appear in a list just like podcasts in the iPod player appear; tap on a book in the list, and either the front cover or the last page you read before closing the book appears. You change pages by swiping right (forward) or left (backward). I've noticed a slight pause when swiping pages in the table of contents; I think the cause is that each chapter is hyperlinked (I haven't noticed this on pages w/o hyperlinks).
The "page" is very readable, as readable as Google Reader and probably more so because you can change the font size on a page. However, there's only one screen mode for the app; landscape isn't (currently) an option.
You can buy Kindle books and read them on the iPhone app without owning a Kindle or Kindle2.
The only other major issue I can think of is reading books on the iPhone screen; some people won't go for it. Some will, myself included. I may change my mind after reading a half-dozen books on my phone, but for now the app suits my purposes.