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Library of Congress: Copyright
This site from the Library of Congress provides the homepage of the United States Copyright Office. The information provided on this page is very helpful on the subject with many links to frequently asked questions, as well as laws and...
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Creative Commons
Creative Commons is a non-profit organization that offers tools to authors and artists to create a "some rights reserved" copyright.
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U.s. Copyright Office: Copyright Law of the u.s.a.
This site, presented by the Library of Congress and the U.S. Copyright Office, contains links to the text of the U.S. Copyright Law, updated to April 2000. The information is very in-depth on the subject.