Pamela Samuelson has self-archived "The Google Book Settlement as Copyright Reform" in SSRN.
Here's an excerpt:
This Article explains why certain features of U.S. law, particularly copyright law, may have contributed to Google’s willingness to undertake the GBS project in the first place and later to its motivation to settle the Authors Guild lawsuit. It then demonstrates that the proposed settlement would indeed achieve a measure of copyright reform that Congress would find difficult to accomplish. Some of this reform may be in the public interest. It also considers whether the quasi-legislative nature of the GBS settlement is merely an interesting side effect of the agreement or an additional reason in favor or against approval of this settlement.
