I have five books published, and two of them are on Google Books. I probably should check the others out. I would say that the value of the remaindered book is basically what you can sell it for out of the back of your car. Remaindered books are trashed by the hundreds, but now I find that with my books on Google, people are contacting me because they accidentally stumbled on a book they never would have read otherwise and are taking these out-of-print books. I actually am selling books, and I find my wife is always racking up bills for books she's found online because they were on Google Books.
You say you work with Google. Do you think there's a way of building a market there for people who would never check out a subject or an issue in a bookstore, but when they do random searches, the books are starting to appear? Whether it's part of an article or a full article, they're going to want to track down that original book. Is that where that market is going to go?