I found this through Lucky Magazine:
http://www.luckymag.com/shopping/charity/2008/09/breast_cancer

The Avon Foundation Breast Cancer Crusade funds screening exams and mammography for low-income women; over one million have been provided since 2000. On the Web at avonfoundation.org.

The Breast Cancer Research Foundation awards grants to scientists around the world working to define the origins of the disease and create new and better treatments. On the Web at bcrfcure.org.

The Libby Ross Foundation offers support programs for women recently diagnosed, as well as for survivors. On the Web at thelibbyrossfoundation.com.

The National Breast Cancer Coalition lobbies to increase federal funding for breast cancer research and quality health care at national, state, and local levels. On the Web at stopbreastcancer.org.

Susan G. Komen for the Cure has invested $1 billion in research, education, and health services since its inception in 1982. On the Web at komen.org.

The Women's Cancer Research Fund, an Entertainment Industry Foundation initiative, supports early diagnosis and prevention research. On the Web at eifoundation.org.