http://www.cnn.com/2009/HEALTH/02/11/health.hiv.stemcell/

An HIV+ leukemia patient in Germany received a stem cell transplant from a donor with the CCR5 delta32 gene mutation. That mutation is attributed to immunity from the bubonic plague, and there are indications it also confers at least a resistance to the most common strain(s) of HIV. Two years after the transplant, and without retroviral medication, there appears to be no sign of the virus in his system.

The treatoment method is a bit extreme, but damn, if that isn't progress...