Just saw this article and this article and thought they were amazing. Here is the gist of the story:
A man with both AIDS and leukemia was given a bone marrow transplant. The doctors decided to use marrow from a donor that had a rare genetic mutation that makes one pretty much immune to AIDS. Before the transplant, they did the typical radiation and chemotherapy treatments to lower his immune system. Anyways, it seems that the transplant has cured his AIDS. Two years after the transplant his body was still free of the virus. Doctors need to study it more to find out if it was a fluke or there were other factors working. The only con to this procedure is that only 30% of cancer patients survive it. I'd imagine that the chemo/radiation was an important factor in the treatment, but the article doesn't talk about whether people without cancer would have an easier time surviving the transplant.
Either way, it's fascinating and exciting.