Peter duesberg isn't dumb.
He was one of the first to find a cancer causing gene, he got all the research grants he asked for until....
He disagreed with the HIV -> AIDS theory
http://www.duesberg.com/presentations/$bnAIDSQuiz.pdf
Just for those who can't be arsed to read it: It basically says that AIDS in Europe and the US is a result toxics and, in the case of hemophiliacs, repeated blood transfusions, while AIDS in Africa is a result of malnutrition and poor water conditions.
The Perth Group, http://www.theperthgroup.com/index.shtml, like Peter Duesberg, disagrees with scientific consensus.
Then, there is also the documentary House of Numbers, which I can't wait too see online.
http://www.houseofnumbers.com/