Project Gutenberg is a fantastic project which aims to put all out of copyright books on the internet for free. So far they have over 33,000 ebooks available to download in a variety of formats. Lots of devices are supported including iPad, Kindle, Nook, Sony Reader, iPhone, iPod Touch, Android or other mobile or cell phone.
So if like TOTD you have recently bought a Kindle, it is an invaluable source of free classic literature.
Plus it you want to help out with this project you can volunteer your services as a proof reader.