Global AIDS Epidemic Update
From the Joint United Nations Programme on HIV/AIDS. These statistics are updated once a year. http://www.unaids.org/en/KnowledgeCentre/HIVData/

U.S. Centers for Disease Control and Prevention
Overall HIV/AIDS statistics for the country are updated twice a year. You can enter your email address to find out about future updates. http://www.cdc.gov/hiv/topics/surveillance/index.htm

California Dept. of Health Services Office of AIDS
AIDS case statistics are updated monthly, with archived reports dating from 1997. http://www.dhs.ca.gov/ps/ooa/Statistics/default.htm

San Francisco Dept. of Public Health
HIV Seroepidemiology & AIDS Surveillance Section. Statistics are updated quarterly. http://www.sfdph.org/dph/files/reports/default.asp

Kaiser Family Foundation HIV Fact Sheets
Compiled by the Kaiser Family Foundation, these fact sheets show world-wide HIV/AIDS statistics by demographic and region. http://www.kff.org/content/factsheets.cfm?topic=hivaids