Man! Where is my brain? In any free reading resource list, I really have to add the Baen Free Library. No classics there though.
While there may be some overlap, I'm pretty sure that Project Gutenberg has the most extensive library in terms of different books and formats to read them in.
Merci! Spasibo!! Danke!!! Gracias!!!! Arigato!!!!! I need to google more. I wonder if the Library of Congress is online... Edit: Yes it is. LOL at the National Jukebox!