calibre introduces
Open Books: a database of drm-free ebooks outside the public domain.
There is a link to open books on the calibre home page. Spread the word.
If you are an author or publisher of DRM-free e-books please contact me with your information on this thread or via a private message and I will add you to the database.
Open Books is a developing project. We will be adding books regularly and will introduce a search function and other features as our collection of books increases. We already have some authors on mobileread on our list.