Google Books
Use Google Books to search and preview millions of books from libraries and publishers worldwide.
Book Search works just like a web search. When a book contains a match for your search terms, simply click on the title to see basic bibliographic info just like you'd see in a library catalog. "If the book is out of copyright, or the publisher has given us permission, you'll be able to see a preview of the book, and in some cases the entire text. If it's in the public domain, you're free to download a PDF copy." (http://books.google.com/googlebooks/about.html)
