Google's much-talked-about print.google.com service is now available for beta testing. This free service allows you to search for keywords inside the texts of, theoretically, every book published in the world (although the reach isn't quite that broad yet). The launch of this service isn't getting big headlines anywhere, but we think it's big news. As we wrote in December when Google first announced these plans, it's controversial news as well. What do you think about this ambitious technology company and its inroads into the book biz?