Four weeks ago, I railed against Google Books for removing the "search my library" feature. I also sent them a complaint and I wasn't very sanguine that they'd put it back. I was wrong. Even though this feature's appearance is somewhat altered, I can now search "my library."
To recap why I so desperately wanted it back: this feature allows me to search through my hard copy books electronically. To add a book to "my library", all I have to do is find the book in Google books and add it to "Bookshelves" (was "my library"). Once the book is on one of my bookshelves, I can go to "my library" and do a search for key words, for example, and all the books that I have that have these key words will be displayed. If the publisher has allowed Google Books to display a snippet view or limited view, then this can also be displayed. All public domain books allow full view.
Happy "my library" search everyone.