From OneWorld.net:
The World Health Organization (WHO) and the UNAIDS Secretariat welcome the publication today in The Lancet of the detailed findings of two trials undertaken in Kenya and Uganda to determine whether male circumcision has a protective effect against acquiring HIV infection.
Funded by the US National Institutes of Health, the trials were terminated early on 12 December 2006 on the recommendation of their Data and Safety Monitoring Board. The findings of the two trials support the results of the South Africa Orange Farm Intervention Trial, funded by the French National Agency for Research on AIDS (ANRS), which were published in late 2005. Together the three studies, which enrolled more than 10,000 participants, provide compelling evidence of a 50 to 60% reduction in heterosexual HIV transmission to men.
More here.