It wouldn't be the first time someone has been cured of HIV from a bone-marrow transplant (http://news.bbc.co.uk/1/hi/7726118.stm). However, this cannot be seen as a cure for HIV.
Some people have a genetic mutation called delta 32 which is a small deletion causing the expression of a defective chemokine co-receptor called CCR5, a molecule which is pivotal in the entry of HIV virus into our T-cells.
A bone-marrow transplant from someone with this mutation can work (and indeed has worked), but of course it's extremely expensive, requires a highly skilled surgeon, and requires someone with this mutation who is willing to be a donor.
As the HIV/AIDS pandemic is largely confined to sub-saharan Africa, this can't be seen as an effective method of curing HIV, and due to problems with cost, adherence, side-effects of anti-retrivirals for people who suffer from HIV, it's thought that the only real way to stop the HIV pandemic will be a vaccine.
I recommend http://www.iavi.org/Pages/home.aspx for news relating to advances in HIV medicine.