National Institutes of Health
The Cancer Genome Anatomy Project
This resource, established by the National Cancer Institute, deals with the genetic conditions that cause cancer, and are present in cancerous tumors.
PBS
Nova: Cancer Warrior
Animations of the different phases of cancer, make this a great resource for understanding the development of this disease.
National Cancer Institute at the National Institutes of Health
National Cancer Institute: Cancer Genetics Overview
This site provides extensive information about the relationship of genetics to cancer.