Google Book search (http://books.google.com) lets you search books and read the results in the context of the book itself. Once you find a book, you can then read the entire book. But reading a book in the web browser while connected to Google isn't the way most people like to read.

Google's got a new app called Google Book Downloader (http://www.codeplex.com/GoogleBookDownloader) that lets you download complete books from Google and save them as PDFs on your computer. You can then read them later. And if you have a good PDF reader, or a portable one, this can be a much better way to go.

Once you install the app, the only trick to it is that you need to know the Google "book code" for the book you want to download. To determine the "book code", look at the URL in the address when you are looking at the book in Google. Here's an example of such a URL:

http://books.google.com/books?id=n2FA-nwz7GYC&printsec=frontcover&dq=subject:%22+Literature+%22&as_brr=3&rview=1#PPR10,M1

The "book code" is the value in the id variable (everything past id= and up to the next &), in this case the "book code" is n2FA-nwz7GYC. Enter this value into the book downloader and it'll download the book in question.