Using Free Digital textbooks in K-12 FREE Live Chat

There will be a live chat on March 9, @ 2PM EST on the "benefits and challenges of using free digital textbooks in K-12 Classrooms" as experienced by California teachers.
http://www.edweek.org/ew/events/chats/2010/03/09/

Pathfinder's and Google Books

I've never really thought of using Google books on a Pathfinder. At the university level, we teach our students that Google books are available, but students may not have access to the entire book. I am of two minds about this. On one hand, it really does have the potential to expand your collection without the support of a budget. On the other hand, how much are we really expanding collections if we only have access to parts of a book. Also, what are we teaching our kids, by telling them it is o.k. to only have access to partial information? Will they ignore a relevant pathfinder source that is in print in favor of one on the web?

Other sources that I think could be utilized in lieu of, or in conjunction with, Google Books could be Project Gutenburg (albeit older books), Library of Congress (also historical), state library consortium's access to digital books (Maryland Digital Library), and possibly college or university libraries. I'm not anti-Google books, but I think we also need to take a close look at the drawbacks of using them and explain those to our students.