"We think most publishers and authors will choose to participate in the publisher program in order to introduce their work to countless readers around the world. But we know that not everyone agrees, and we want to do our best to respect their views too. So now, any and all copyright holders – both Google Print partners and non-partners – can tell us which books they’d prefer that we not scan if we find them in a library. To allow plenty of time to review these new options, we won’t scan any in-copyright books from now until this November."
Google Print makes it possible for users to search through entire books, you can find the service here.