In a speech during the International AIDS Conference in Washington, D.C., on Monday, U.S. Secretary of State Hillary Rodham Clinton pledged $157 million in new funding for the global effort to curb the spread of HIV/AIDS. The funding will be used for several programs to prevent or lower infection rates, including initiatives to end mother-to-child HIV transmission by 2015 and circumcise about 500,000 men in South Africa.