According to the Fair Labor Standards Act (FLSA) of 2007, the minimum wage increases to $6.55 an hour effective today, July 24, 2008. On July 24, 2009, the minimum wage will rise to $7.25 an hour, the third and final increase dictated by FLSA.
For more information, see Compliance Assistance - Fair Labor Standards Act (FLSA) from the U.S. Department of Labor.