Actually, as a person living in China I can tell you that the number of new cases of SARS everyday has dropped to under 10, and like half the time it's under 5.
The reason why they say the Epidemic is under control, from what I can gather.. is..
The majority of the cases come from already suspected patients. Very rarley (maybe 1 or 2 a day) do they have new cases pop up outa nowhere. Thus, the virus is not so much 'In the wild'.
After they found a bleach sollution that could kill it they disinfect all the public transportation and Taxis once a day, but most people in Beijing and alot of the effected areas are still warry about going out in public so most people wear their masks and bike to work. If traffic is heavy, a bike can actually be better than a bus or taxi so it's not that much of a step down.
I remember just a few days ago, China had 0 new cases of SARS. That was a huge milestone.