Google Book Search

Google Book Search is an index of book content that makes it easy to find books that interest you. Like a card catalog, it helps you learn where to get the full book from a bookstore or a library. Use the Google Book Search homepage to get only book results, or Google.com to see book results as part of your regular search results. Google Book Search makes the full text of millions of books (including out of print and public domain books) instantly searchable, and makes those books discoverable. For authors and publishers, it means that millions of booksare instantly discoverable - and able to be purchased. Google Book Search acts as a free marketing program that protects copyright while dramatically expanding the potential audience for, in theory, every book in the world.

http://books.google.com