It is! It is actually quite an amazing process. I wish I had time to discuss it at length now, but as I have to leave in just moments I will fall back on that most base of rhetorical tools: quoting myself on the subject.
An intriguing procedure was carried out by a group of doctors from Charite Universitatsmedizin Berlin and the Robert Koch Institute, the details of which were published in the February 2009 New England Journal of Medicine. The patient was a 40 year old, white male who was HIV+, heterozygous for the CCR5delta32 mutation, and afflicted with acute myeloid leukemia. As chemotherapy interfered with his HAART treatment, a CD34 stem cell transplant was performed. A list of HLA matching donors was found, and these potential donors were screened for CCR5delta32 homozygosity. The patient received an initial load of stem cells and then, after a relapse, underwent total body radiation and received a second load. HAART was discontinued after the first treatment. 20 months after discontinuation of HAART there has been no rise in viral proteins. Further PCR assays reveal that the patient is now homozygous for the CCR5delta32 mutation
And here are a number of references on this particular case and the more general topic of inhibiting HIV via CCR5:
Hutter, G., Nowak, D., Mossner, M., Ganepola, S., Musig, A., Allers, K., Schneider, T., Hofmann, J., Kucherer, C., Blau, O., Blau, I., Hofmann, W., and Thiel, E., (2009). "Long-Term Control of HZIV by CCR5 Delta32/Delta32 Stem-Cell Transplantation." New England Journal of Medicine
Shearer, G., Clerici, M., (1996). "Protective immunity against HIV infection: has nature done the experiment for us?" Immunology Today
Lui, R., Paxton, W., Choe, S., Ceradini, D., Martin, S., Horuk, R., MacDonald, M., Stuhlmann, H., Koup, R., and Landau, N., (1996). "Homozygous defect in HIV-1 coreceptor accounts for resistance of some multiply-exposed individuals to HIV-1 infection." Cell
Verani, A., Lusso, P., (2002). "Chemokines as natural HIV antagonists." Current Molecular Medicine
It is notable that this is not without its own risks. In fact there was a recent review article on that topic, I will try to dig up the reference a little later.