What does Google Books offer?

Does Google Books have something to offer publishers that other services do not? This is the question I posed to myself after reading Edward Nawotka's piece  at PublishingPerspectives. His article follows the news of Google's new partnership between ActualLitté and Google Books. The plan of editor/founder Nicolas Gary is for the ActualLitté magazine to present a selection of older books, i.e. classics, from Google's library with themes relevant to current news topics.

Since this is my first look at this subject, please share your own experience if you have one. This could be an important consideration for internet publishers. 

Google's service  includes: 

1. the latest index of the world's books

2. a Bookstore that also connects to independent internet booksellers   

3. library lending (do you need references?)

4. a book preview that shows more than Amazon or Apple

If your book is in Google's library will that help sales? In the days of print and print-book libraries, it was understood that library circulation of a book generated sales. We shall see if the same is true for electronic circulation. Any circulation should stimulate news of a book by word-of-mouth. 

A decline in interest in Google Books due to the Google settlement might cause  Google to lose interest in its books, particularly here in the USA. Does your website have a link to the presentation of your book in Google Books?