A good way to start is at the virtual media centre of the 2006 international AIDS conference (www.kaisernetwork.org/aids2006/index.cfm#guide). You can listen to podcasts, watch lectures and press conferences, and find up to date information for free.
Another excellent source is the specific section of the World Health Organization's website, which includes comprehensive information on diverse topics (www.who.int/hiv/en). Publications about epidemiology, the theory of drugs, pathophysiology, and more are available.
Hosted by the US National Institutes of Health (NIH), the specialised information services on AIDS (http://sis.nlm.nih.gov/hiv.html) give a full picture of scientific advances in the area. The website is extremely informative, with data on anti-HIV drugs and impressive drawings. It also links to other sites that might help answer your toughest questions.
For a European perspective visit www.eurohiv.org. It covers surveillance of HIV/AIDS in countries of the WHO European region. It's worth looking at the sets of slides, such as HIV