Google announced yesterday that it's making a large number of books available via web-enabled mobile phones. Now, Amazon has said that it will unveil a new version of the Kindle next week and also make Kindle titles available on a variety of mobile phones. You can get more info here.
UPDATE: We have created a large collection of Free eBooks, which includes ebooks provided by Google. Please visit this page to access free ebooks on your computer, smart phone (including iphone), or kindle.