The Internet Archive – Access to historic and contemporary audio, music, and digitized video collections
Librivox – Public domain books recorded by volunteers and available for online listening
MIT OpenCourseWare – Online college-level textbooks featuring science, engineering, and technology subjects
National Jukebox – Historical Recordings from the Library of Congress
Open Book Library – Over a million public domain ebooks to download or read online, plus an open lending library collection of modern ebook fiction and non fiction
PBS American Experience – Watch full length episodes online
Project Gutenberg – Over 70,000 free ebooks to download or read online