The fourth virtual World e-Book fair (July 4 - Aug 4, 2009) sponsored by a number of e-libraries including Project Gutenberg, The World Public Library, Digital Pulp Publishing, Internet Archive and others has offers free download of over 2million e-books from their library for one month.
Just use the search box of the World e-Book fair for finding e-books and download your selection.
According to World e-Book fair “Our goal is to provide free public access for a month to 2 Million e-Books. During the rest of the year you may continue to download your selection of about 500,000 PDF e-Books by joining the World Public Library. Annual membership is only $8.95 per year.