I'm a graduate of the University of Wisconsin-Madison, so I was excited to hear Google has added the entire collection of public domain historical resources from the UW-Madison and the Wisconsin Historical Society Library to its Google Books Library Project. Maybe excited isn't exactly the right word, but I still think this is a pretty cool project and I'm proud of my alma mater for contributing.
BTW, the UW-Madison and Wisconsin Historical Society historical document and book collection, at 7.2 million holdings, is one of the largest collections in the United States, ranked 11th in North America. I doubt this is included in this project, but an interesting side note about UW-Madison/WHS, is they co-sponsor the Wisconsin Center for Film and Theater Research. The WCFTR is one of the largest archives of entertainment industry research material in the world.
The University of Wisconsin-Madison joins the impressive list of project partners that includes the University of California, University of Michigan, Harvard University, Stanford University, the New York Public Library, Oxford University and the Universidad Complutense de Madrid.