It'll be fascinating to see what Amazon.com does in this context.
Google won't say how many books are currently in its index. But with the ability to scan books at six of the world's biggest libraries, Google's library of public domain titles could surpass that of the Gutenberg Project, which contains about 16,000 titles. Meanwhile, Google rivals Yahoo Inc. and Microsoft Corp. are establishing the Open Content Alliance, an alternative index of public domain books. A number of major libraries have signed up to participate, including the Boston Public Library, Johns Hopkins University, the Smithsonian Institution, and the National Archives of the United Kingdom.