Dana, at one point, condom use was incredibly high. Unfortunately, the "safe sex" message became diluted (welcome to the world of "abstinence only" sex ed). There were fewer ads, budgets for various AIDS projects were cut, and the availability of condoms at clubs became far more rare. It appears that younger gay men are sensing an invulnerability and not heeding what was learned in the past. Additionally, with the medications available, people are living longer with the disease. Some feel a cure will be found at some point in the near future. Therefore, the pressure to engage in safe sex has lessened. Apparently some think that they'll never get the disease, or if they do, they'll live long enough to participate in a cure.
The closest major city to where I live suffers most from HIV transmission among women who are prostitutes and drug users. Therefore, the focus there is more aimed at drug abuse and the gay folks really aren't getting any message. The AIDSProject group in the city faced major budget cuts and so focused their attention on the group most affected.