Charles W. Bailey, Jr. has published version 2 of his Google Book Search Bibliography.
From the introduction: "This bibliography presents selected English-language articles and other works that are useful in understanding Google Book Search. It primarily focuses on the evolution of Google Book Search and the legal, library, and social issues associated with it. Where possible, links are provided to works that are freely available on the Internet, including e-prints in disciplinary archives and institutional repositories. Note that e-prints and published articles may not be identical."
Looks pretty darn comprehensive!