Is mammography a flawed technology?

[Star Tribune, November 21, 2009] Mammograms are in the spotlight as the uproar continues over how often and at what age women should get them. In the 1990s, Christine Norton would show up at the annual Twin Cities Women's Expo for three days in a row to hand out instruction cards on breast self-exams. She was such a fervent believer in mammograms that she begged friends to get them every year. To Norton, who was 43 when she learned she had breast cancer, it seemed like a matter of life and death.