Public Domain Sites

Do you have any suggestions as to websites or blogs where we can all visit to pick up some public domain material? This could be books or images or films or comics, whatever. Please use the comment section to add your suggestions.

As I noted, to me one of the absolute best sites to find books that are in the public domain is Gutenberg. This site is excellent and well organized.

You can find an excellent source of comic books that are in the public domain at The Digital Comic Museum. Check it out. Read a comic or two and you will get some ideas for a story you might want to write.