Goodreads now offers a link to previews of books through Google Book Search when available. You can view and search the text while still inside Goodreads. One thing that would be nice is a jump-to-page option, but that’s okay. For more of the GoogleBook functionality, Goodreads also links out to the GoogleBook page for the book.
This is part of the reason why I love Goodreads. It’s not that they are innovative–it’s that their innovations are so useful (e.g., does anyone else think it’s cool that it will search WorldCat?).
As an old cataloger, I wish our OPACs were as versatile and useful as Goodreads and other book-lover sites.