This article has been just updated:

Google Inc. has announced the launch of its new service: Google Books.
Currently, you can purchase books (U.S. only) or download more than 3 million free books from anywhere in the world using this service.

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As announced by Google, the aim of this project is to provide users with their own bookshelf on hand, no matter where they are.

Purchased or downloaded books can be read using a desktop browser, as well as through mobile devices based on the Android operating system or iOS.

google books downloader

Additionally, the books can be read on any e-reader with Adobe Digital Editions software.

As opposed to the Picasa service which provides access to photos, the Google Books service does not allow users to download free electronic editions without digital copy protection and use them on other devices.

Google Books Downloader is a little software that allows you to save these books in PDF, JPEG or PNG format (note: it supports only the books marked as full view).

 
 Google Books Downloader (for Windows)
windows book downloaderSave Google books in PDF, JPEG or PNG format.  Size: 590 KB
Version: 2.7
Date: 01/31/2017
Windows: 2000/XP/Vista/Seven/8.1/10
Download
Google Books Downloader Mac (for Macintosh)
mac book downloaderSave Google books in PNG format on a mac.  Size: 5 MB
Version: 1.0
Date: 09/27/2011
Mac OS:
Snow Leopard 10.6 or later,
Lion 10.7 or later
Download 
Books Downloader (for Android)
Save Google books in PDF format on an Android.
* Don’t forget to enable Unknown sources in your Android device Settings, before installing apk, else Android platform will not allow you to install apk directly.
screenshot 1, screenshot 2
Size: 1.34 MB
Version: 1.2
Date: 01/10/2013
Android:
2.2 or later
Download
Adobe Reader XI (for Windows)
windows book downloaderA software that lets you view and print Portable Document Format (PDF) files. Version: latest
Windows: 2000/XP/Vista/Seven/8.1/10
Download 

 

Screenshot (Mac OS X):Google Books Downloader for Mac

Screenshot (Android):
Google Books Downloader for Android

Screenshot (Windows):
Google Books Downloader for Windows