While I love the Internet Archive, their search can be a bit of a mess. They often have several copies of the same work in varying qualities, with no easy way to find the best one, they have somewhat inconsistent standards in tagging, and they frequently have copyright-encumbered works inadvertently available. As people mentioned below Project Gutenberg is excellent for finding public domain books, but there seems to be no way to search for and watch most public domain films in a reasonable quality – or even high definition. Is anyone trying to fix that?