More and more E-books are now becoming freely available on the web. Take a look at http://manybooks.net – with nearly 20,000 e-books available, in multiple languages and all free to download to PC, Ipod, palm reader etc.
Another interesting site is http://www.justfreebooks.info. This engine searches the content of more than 450 web sites to find public domain texts, open books, free audio books, ad-supported books and more. Use the search box to enter the book, author or theme you are interested in.
Adobe Reader will read downloads from both of these sites on your computer. Free E-book reader software is available for use with Ipods and other media.