openwa.org is a great site to bookmark.

Quill West developed this page:

http://open.tacomacc.edu/

Emily Wood, a librarian at Pierce College, put together a helpful page:

http://www.scoop.it/t/finding-oer

Another great source:  Directory of Open Access Journals (peer-reviewed journal articles – no subscription fees or costs).

http://www.doaj.org/

Pictures you can legally use:

Library of Congress Photo Galleries
http://www.loc.gov/pictures/

NIH Photo Galleries
http://www.nih.gov/about/nihphotos.htm

Creative Commons is a great source for pictures, music, video, and text people have created for sharing:
http://search.creativecommons.org/