I just discovered a beautiful organization called Photosensitive
I will let them speak for themselves:
PhotoSensitive was founded in 1990 as a non-profit collective of photographers determined to explore how photography can contribute to social justice. Their idea was to bring together the photographic talents of a number of Toronto-based professional photographers, to harness the power of the camera to achieve social goals. Each photographer would bring his or her own vision to the subject; the sum of these visions would provide a compelling social comment.
The subject matter of their projects ranges from homelessness to child poverty. From HIV/Aids to Rwanda. They have two cancer-related projects: Cancer Connections and TIEd together (prostate cancer project). Their talented photographers build stories with their pictures, use their pictures to comment on issues and also to encourage the viewers to take action.
Their gallery contains an incredible collection of photographs which I encourage you to view.