http://www.dol.gov/
The U.S. Department of Labor site has the latest numbers from the Bureau of Labor Statistics plus reports on every aspect of work in the United States.

http://www.bls.gov/opub/mlr/mlrhome.htm
The Monthly Labor Review site provides abstracts of all articles from 1988 to the present.

http://www.aflcio.org/home.htm
News and information about various aspects of work, including safety, from the AFL-CIO.