Google have just announced Google eBooks, formerly known as Google Editions.
Detailed here at the Official Google Blog, eBooks is said to include over 3 million books and will include clients for a number of devices including those running Android and iOS.
The Android client will be hitting the market soon, but you don't want to wait do you? No, I didn't think so... so why don't you download the Google eBooks APK here - DOWNLOAD (ROMraid), a MoDaCo exclusive?
The official Google eBooks site can be found at http://books.google.com/ebooks.