This New York Times article proposes that circumcision prevents AIDS. Of course, things are not so simple.
We agree on one point: the spread of HIV (and other STDs for that matter) in uncicrumcised men is less than those in circumcised men.
But Tina Rosenberg's article misses the important point: one has to get a disease in order to spread it. So while I might agree that in some contexts - circumcision is (way) better than nothing - it is neither a vaccine, nor a good argument for universal circumcision.