BookShare.org has a clearly defined purpose; to provide online access to print publications to blind and visually impaired readers.
Contemporary books and materials in the public domain are digitized and converted into the Braille format or converted into the digital talking book format. These can then be downloaded into the appropriate device.
CBS News did a news segment on the founder of BookShare in the QuickTime video format.
Currently there are 6,000+ subscribers and the content is in English and Spanish. Unlike other free book archives, only those people that legal qualify as being blind or vision impaired can download contemporary books and publications. The public domain materials are available to all users.
It is a good resource to pass on to a friend.