Posting to NGC4LIB
Here are some important comments in an article from the Guardian: Google can't be trusted with our books / Simon Barron. (Guardian online 26 April 2011) http://www.guardian.co.uk/commentisfree/2011/apr/26/google-books-videos
"Google announced last week that it would be deleting the content of the Google Videos archive. After a public outcry, it said it would work on saving all the video content and making it available elsewhere. In this instance, the public managed to change Google's mind and stopped the mass deletion of a unique digital archive but the situation raises concerns about data under Google's control, including the unique archive of Google Books."
The author goes on to discuss some other points, including metadata. My own opinion is that these issues can and will be solved once Google can "monetize" its books project. As it stands now, it is just an expensive, interesting financial exploration.