Welcome to MR, Chris
MR has free ebooks beautifully handcrafted by dedicated MR members. I think your Reader uses
ePub format.
nomesque already mentioned three really great sites and you can check these also...
manybooks.net and Project Gutenberg
Australia and
United States.
You can explore using
Calibre to manage your library of DRM free books and Kovid, the creator, frequents the forums here. We even have a dedicated
Calibre forum.
Have fun in the forums and ask if you have any questions.
PS Check my signature links.
