Electronic Books:
Bartleby.com - http://www.bartleby.com
HippoCampus - http://www.hippocampus.org (ebooks and other educational resources)
Southern California Digital Library - http://scdl.lib.overdrive.com (includes audio books)
BooksShouldBeFree.com - http://www.booksshouldbefree.com (audio books)
Community College Open Textbook Collaborative - http://collegeopentextbooks.org
Community College Consortium for Open Educational Resources - http://oerconsortium.org (ebooks, webinars and other educational resources)
Internet Archive - http://www.archive.org/details/texts (ebooks, images, video, etc.)
Librivox - http://librivox.org (audio books)
The Open Library - http://openlibrary.org (large selection)
Google Books - http://books.google.com
Flat World Knowledge - http://www.flatworldknowledge.com
Audio Owl - http://www.audioowl.com (audio books)
The Free Library - http://www.thefreelibrary.com (large selection)
Simulations and Games:
Thinkfinity - http://thinkfinity.org (Large selection including lesson plans and other resources)
Playing History - http://playinghistory.org
Purpose Games: Create, Play Learn - http://www.purposegames.com
Examples:
E-books
Podcasts
Videos
Simulations and Games
See More Resources