Came across this result when searching for Wittgenstein's Mistress today. Apparently something called "Google Print" is in beta.

Google's mission is to provide access to all the world's information and make it universally useful and accessible. It turns out that not all the world's information is already on the Internet, so Google has been experimenting with a number of publishers to test their content online. During this trial, publishers' content is hosted by Google and is ranked in our search results according to the same technology we use to evaluate websites.

On Google Print pages, we provide links to some popular book sellers that may offer the full versions of these publications for sale. Book seller links are not paid for by those sites, nor does Google benefit if you make a purchase from one of these retailers. In addition, these pages show contextually-targeted AdWords ads that are served through the Google AdSense program.

Is this new, or have I just not been paying attention?