The Association of Research Libraries (ARL), American Library Association (ALA), and Association of College and Research Libraries (ACRL) have created a 9-page document on which groups have filed what documents related to the Google Book Settlement. Brandon Butler, Law & Policy Fellow for ARL authored "The Google Book Settlement: Who Is Filing and What Are They Saying?"
There is a lengthy list of supporters (pro-users and pro-competition), filers with reservations (anti-users, anti-rightsholder), and opponents (anti-competitor, anti-rightsholder, Anti-user, Other). Check it out! Speaking of "battle of the books..."